Publish images via CI; file staged-promotion overlay debt

flex-auth had no image workflow, so its production images were hand-built
on a workstation and pushed with workstation credentials -- an artifact
whose provenance was someone's working tree rather than a forge revision.
Ports activity-core's canonical image.yaml: the container-build runner
fetches a tarball of the pushed commit, builds, and pushes :latest and
:main-<short-sha>, then reports the immutable digest for the rollout step.

examples/** is a build-trigger path on purpose -- policy packages are
COPYed into the image and there is no hot reload, so a policy change is
an image change.

Runbook updated to say plainly that images are not built on workstations.

FLEX-WP-0011 filed for the rest of the gap: flex-auth runs two production
Deployments on railiance01 but has never been brought under the
staged-promotion contract (RAIL-BS-WP-0006). No railiance/app.toml, no
stage commands, no canary or approval evidence; the deploy/ directory is
a rescue of specs that existed nowhere, not the sanctioned overlay shape.
Pre-existing debt found during the FLEX-WP-0010 rollout, not a regression
from it, and not a blocker for routine policy rollouts -- flex-auth fails
closed. T03 also flags that the coulombcore drain plan still lists
flex-auth on a host it no longer runs on.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.forgejo/workflows/image.yaml

@@ -0,0 +1,65 @@
+name: Build and Publish Container Image
+
+# Modelled on activity-core/.forgejo/workflows/image.yaml -- the fleet's
+# canonical image-publish pattern. Images are built by CI from a tarball of
+# the pushed commit, never from a workstation working tree, so the artifact's
+# provenance is a forge revision.
+#
+# `examples/**` is a build-trigger path on purpose: the policy packages are
+# COPYed into the image (see Containerfile) and there is no hot reload, so a
+# policy change is a new image.
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - ".forgejo/workflows/image.yaml"
+      - "Containerfile"
+      - "cmd/**"
+      - "internal/**"
+      - "pkg/**"
+      - "examples/**"
+      - "go.mod"
+      - "go.sum"
+  workflow_dispatch:
+
+env:
+  REGISTRY: forgejo.coulomb.social
+  IMAGE_NAME: coulomb/flex-auth
+  DOCKER_HOST: tcp://127.0.0.1:2375
+
+jobs:
+  build-and-push:
+    runs-on: container-build
+    steps:
+      - name: Build and push image
+        env:
+          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+        run: |
+          set -eu
+          REF="${GITHUB_SHA:-main}"
+          SHORT="${REF:0:7}"
+          mkdir -p buildctx "${HOME}/bin"
+          wget -qO /tmp/repo.tar.gz \
+            "https://forgejo.coulomb.social/${GITHUB_REPOSITORY}/archive/${SHORT}.tar.gz"
+          tar xzf /tmp/repo.tar.gz -C buildctx --strip-components=1
+          wget -qO- https://download.docker.com/linux/static/stable/x86_64/docker-27.3.1.tgz \
+            | tar xz --strip-components=1 -C "${HOME}/bin" docker/docker
+          export PATH="${HOME}/bin:${PATH}"
+          echo "${REGISTRY_TOKEN}" | docker login "${REGISTRY}" -u "${REGISTRY_USER}" --password-stdin
+          IMAGE="${REGISTRY}/${IMAGE_NAME}"
+          docker build -f buildctx/Containerfile -t "${IMAGE}:latest" -t "${IMAGE}:main-${SHORT}" buildctx
+          docker push "${IMAGE}:latest"
+          docker push "${IMAGE}:main-${SHORT}"
+          echo "pushed ${IMAGE}:latest and ${IMAGE}:main-${SHORT}"
+
+      - name: Report immutable digest
+        run: |
+          set -eu
+          export PATH="${HOME}/bin:${PATH}"
+          IMAGE="${REGISTRY}/${IMAGE_NAME}"
+          SHORT="${GITHUB_SHA:0:7}"
+          # Deployments pin by digest, never by tag -- print it for the rollout step.
+          docker inspect --format='{{index .RepoDigests 0}}' "${IMAGE}:main-${SHORT}"

deploy/README.md

@@ -44,14 +44,18 @@ actually changed.
 The policy packages are baked into the image, not mounted from a ConfigMap,
 so a policy change requires a rebuild — there is no hot reload.
 
-```bash
-# 1. Build and push from a clean checkout of the commit you intend to ship
-docker build -t forgejo.coulomb.social/coulomb/flex-auth:<tag> -f Containerfile .
-docker push forgejo.coulomb.social/coulomb/flex-auth:<tag>
+**Do not build images on a workstation.** The fleet builds in CI so that an
+artifact's provenance is a forge revision rather than someone's working tree.
+`.forgejo/workflows/image.yaml` handles it, and `examples/**` is one of its
+trigger paths precisely because policy changes are image changes.
 
-# 2. Resolve the digest and pin it — deploy by digest, never by tag
-docker inspect --format='{{index .RepoDigests 0}}' \
-  forgejo.coulomb.social/coulomb/flex-auth:<tag>
+```bash
+# 1. Push the commit you intend to ship; CI builds it on the container-build
+#    runner and pushes :latest and :main-<short-sha>
+git push origin main
+
+# 2. Take the immutable digest from the workflow's "Report immutable digest"
+#    step -- deploy by digest, never by tag
 
 # 3. Edit the image digest in the relevant manifest, then apply
 kubectl apply -f deploy/flex-auth-<consumer>.yaml

workplans/FLEX-WP-0011-railiance-staged-promotion-overlay.md

@@ -0,0 +1,120 @@
+---
+id: FLEX-WP-0011
+type: workplan
+title: "Bring flex-auth under the railiance staged-promotion contract"
+domain: infotech
+repo: flex-auth
+status: proposed
+owner: codex
+topic_slug: netkingdom
+planning_priority: P2
+planning_order: 110
+depends_on_workplans:
+  - FLEX-WP-0009
+related_workplans:
+  - RAIL-BS-WP-0006
+created: "2026-08-11"
+updated: "2026-08-11"
+---
+
+# FLEX-WP-0011 - Bring flex-auth under the railiance staged-promotion contract
+
+flex-auth runs two production Deployments on **railiance01**
+(`flex-auth-tenant-engine`, `flex-auth-user-engine`) but has never been
+brought under the staged-promotion contract (`RAIL-BS-WP-0006`) that defines
+what counts as production on that host. This is pre-existing debt discovered
+during the `FLEX-WP-0010` rollout, not a regression introduced by it.
+
+## What is missing
+
+The contract's gate table requires:
+
+| Gate | Requirement | flex-auth today |
+|---|---|---|
+| Overlay repo | `railiance/<app>/` with `app.toml` and stage manifests | **missing** — manifests live in `deploy/*.yaml`, a parallel convention |
+| Stage commands | `stage deploy`, `stage observe`, `stage promote`, `stage rollback` proven | **missing** |
+| Evidence | Backup/restore drill, canary observation, operator approval recorded | partial — probe evidence exists in workplans, no canary or approval record |
+| Registry | Image in forge OCI registry with immutable tag | **met** — Deployments pin by digest |
+
+Two related facts found at the same time:
+
+- The Deployments were originally created by `kubectl-client-side-apply` from
+  a file that existed in no repository. `FLEX-WP-0010` recovered them into
+  `deploy/` from the live objects' `last-applied-configuration` so that
+  rollback no longer depends on a cluster annotation. That directory is a
+  rescue, not the sanctioned shape, and this workplan should absorb it.
+- CI image publishing was added in `FLEX-WP-0010`
+  (`.forgejo/workflows/image.yaml`, modelled on activity-core). Before that,
+  images were hand-built on a workstation with no forge-verifiable
+  provenance. The registry gate is now met by construction.
+
+## Not a blocker for existing traffic
+
+flex-auth is already serving production decisions and its failure mode is
+fail-closed: consumers receive `deny`/`403` rather than an unauthorized
+allow. This workplan closes a governance and recoverability gap, not an
+active safety incident. It should not be used as a reason to hold routine
+policy rollouts.
+
+## T01 - Author the railiance overlay
+
+```task
+id: FLEX-WP-0011-T01
+status: todo
+priority: medium
+```
+
+Write `railiance/app.toml` against schema `railiance.app.v1`, using
+`qonto-assistant/railiance/app.toml` as the reference. Declare `[app]` with
+an honest `criticality` (flex-auth is an authorization PDP whose outage
+blocks consumer writes fail-closed), `[source]` with `digest_policy =
+"required"`, `[rollback]` naming the concrete rollback command, and
+`observability.health_endpoints` for both Services' `/healthz`.
+
+Model stage1/stage2/stage3 on the two-Deployment reality: the two consumers
+are independently pinned and must be independently rollable. Do not collapse
+them into one release.
+
+Reshape `deploy/*.yaml` into the overlay layout (compare
+`activity-core/k8s/railiance/`) and keep `deploy/README.md`'s rollout and
+rollback runbook content rather than discarding it.
+
+Done when the overlay renders and a server-side dry run of the full manifest
+set is accepted.
+
+## T02 - Prove the stage commands
+
+```task
+id: FLEX-WP-0011-T02
+status: todo
+priority: medium
+```
+
+Prove `stage deploy`, `stage observe`, `stage promote`, and `stage rollback`
+against a real candidate image, with a canary observation window and a
+recorded operator approval. Record the previous stable digest as the rollback
+target before promoting.
+
+Done when a full promote-then-rollback cycle has been demonstrated and the
+evidence ids are recorded here.
+
+## T03 - Correct the stale drain-plan row
+
+```task
+id: FLEX-WP-0011-T03
+status: todo
+priority: low
+```
+
+`the-custodian/docs/coulombcore-drain-placement-plan.md` row 23 lists
+flex-auth as living on coulombcore, drain wave 7, status `grandfathered`,
+target railiance01. flex-auth in fact already runs on railiance01
+(`92.205.62.239`); the row is stale and understates progress.
+
+This is custodian canon, not a flex-auth file — raise it with the custodian
+owner rather than editing it from this repo. Confirm at the same time whether
+a coulombcore flex-auth deployment still exists and needs retiring, or
+whether wave 7 can be closed.
+
+Done when the row reflects reality or a custodian decision id explains why it
+stands.