feat(ci): baked CI image + runner config + self-check workflow (T14)

Stand up the foundation's own CI on its Forgejo runner. The committed scope here
is the self-contained half (toolchain + typecheck); the stack-state-dependent
pipelines (pulumi preview, backup-verify) need CI secrets + a state fetch and
land next.

- containers/ci-image/Dockerfile + VERSIONS IMAGE_CI: one baked image carrying
  exactly what preflight validates (pulumi/bun/node/docker/git/age/zstd/jq/vault/
  psql/mc). Built on the VM (like caddy-cloudflare) and used LOCALLY by the runner.
- runner.ts: give act_runner a config.yaml — container.network=foundation-net (so
  job containers reach foundation-forgejo:3000 for checkout + the data plane) and
  force_pull=false (use the local foundation-ci image, no registry). Self-heals on up.
- .forgejo/workflows/ci.yml: preflight (tools + versions vs VERSIONS pins) +
  typecheck (bun install + tsc --noEmit on bootstrap). Gates every push.
- run.sh / backup.sh / restore.sh / dr: take PULUMI_CONFIG_PASSPHRASE from env when
  set (CI secret), falling back to `pass` (operator) — so the scripts run pass-free
  in CI.

Reusable-workflows architecture (per the chosen direction) — the ecosystem CI
(semantic-release, docker/npm/bun builds, eslint/yamllint over the 999_testing.md
candidates) builds on this image + runner next phase.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

containers/ci-image/Dockerfile

@@ -0,0 +1,61 @@
+# foundation-ci — the baked CI toolchain image (T14).
+#
+# A single, pinnable image carrying every tool the foundation's own pipelines need
+# so jobs don't install a toolchain on each run. Referenced by .forgejo/workflows/*
+# via `container: foundation-ci:<tag>`. Built on the VM (like caddy-cloudflare) and
+# used locally by the runner (force_pull:false) — see runner.ts / VERSIONS IMAGE_CI.
+#
+# Carries exactly what preflight/checks/tools.sh validates: pulumi, bun, node,
+# docker (cli), git, age, zstd, jq, vault, psql, pg_dump, ssh, mc — plus pass-free
+# operation (PULUMI_CONFIG_PASSPHRASE + SSH key arrive as CI secrets/env).
+FROM node:20-bookworm
+
+ARG PULUMI_VERSION=3.145.0
+ARG VAULT_VERSION=1.18.5
+ARG MC_RELEASE=RELEASE.2025-04-03T17-07-56Z
+ARG TARGETARCH=amd64
+
+ENV DEBIAN_FRONTEND=noninteractive
+# Install pulumi + bun into /usr/local/bin so they're on PATH for ANY shell/user
+# (a login shell resets PATH, and jobs may not run as root).
+ENV BUN_INSTALL=/usr/local
+
+# --- base apt tools: git, ssh, age, zstd, jq, postgresql-client, docker CLI ----------
+RUN set -eux; \
+    install -m 0755 -d /etc/apt/keyrings; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+      ca-certificates curl gnupg lsb-release unzip \
+      git openssh-client age zstd jq; \
+    # docker CE CLI (jobs build/push images via the mounted host socket)
+    curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc; \
+    chmod a+r /etc/apt/keyrings/docker.asc; \
+    echo "deb [arch=$TARGETARCH signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian bookworm stable" > /etc/apt/sources.list.d/docker.list; \
+    # postgresql-client 15 (psql + pg_dump) from pgdg
+    curl -fsSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor -o /etc/apt/keyrings/pgdg.gpg; \
+    echo "deb [signed-by=/etc/apt/keyrings/pgdg.gpg] https://apt.postgresql.org/pub/repos/apt bookworm-pgdg main" > /etc/apt/sources.list.d/pgdg.list; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends docker-ce-cli postgresql-client-16; \
+    rm -rf /var/lib/apt/lists/*
+
+# --- pulumi (pinned) → copy binaries to /usr/local/bin -------------------------------
+RUN set -eux; curl -fsSL https://get.pulumi.com | sh -s -- --version "$PULUMI_VERSION"; \
+    cp /root/.pulumi/bin/* /usr/local/bin/; rm -rf /root/.pulumi; \
+    pulumi version
+
+# --- bun (pinned via official installer; BUN_INSTALL=/usr/local) ---------------------
+RUN set -eux; curl -fsSL https://bun.sh/install | bash; bun --version
+
+# --- vault CLI (pinned) --------------------------------------------------------------
+RUN set -eux; \
+    curl -fsSL "https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_${TARGETARCH}.zip" -o /tmp/vault.zip; \
+    unzip -d /usr/local/bin /tmp/vault.zip; rm -f /tmp/vault.zip; vault --version
+
+# --- minio client mc (pinned release) ------------------------------------------------
+RUN set -eux; \
+    curl -fsSL "https://dl.min.io/client/mc/release/linux-${TARGETARCH}/archive/mc.${MC_RELEASE}" -o /usr/local/bin/mc; \
+    chmod +x /usr/local/bin/mc; mc --version
+
+# Forgejo Actions overrides the entrypoint with its job script; keep a sane default.
+WORKDIR /workspace
+CMD ["bash"]