Phase-6: enable Gitea Actions, in-cluster act_runner, static CI gate

STEP 1 — enable Gitea Actions: pin GITEA__actions__ENABLED=true and
DEFAULT_ACTIONS_URL=github in the gitea bootstrap patch (was implicit upstream
default; make it a declared property).

STEP 2 — deploy + register an act_runner in a dedicated non-app namespace
(gitea-actions) so the privileged DinD executor sidecar is admitted without a
Kyverno policy exception (restrict-host-namespaces scopes to app namespaces only).
Docker executor + DinD sidecar over a shared TLS-cert emptyDir; runner state on a
Longhorn PVC (registers once). Registration token delivered as a SOPS-encrypted
Secret decrypted by Flux. Runner mounts no ServiceAccount token (R-SEC-02).

STEP 3 — author .gitea/workflows/gate.yml: the live enforced merge gate running
the STATIC layers (spec-immutability best-effort, lint, Kyverno L0, L1 render) via
`make -C ci lint l0 l1` with the pinned toolchain installed at job start. L2/L3
conformance is an if:false placeholder (needs a toolchain image + scoped cluster
creds — a design decision, not wired). merge-gate.yaml reduced to workflow_dispatch
(dormant full-pipeline blueprint). install-tools.sh gains check-jsonschema so the
schema stage validates in CI instead of skipping.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

apps/gitea-actions-runner-secret.sops.yaml

@@ -0,0 +1,37 @@
+# Gitea Actions runner registration token (WS-GITOSS, Phase 6). SOPS-encrypted (age).
+# The in-cluster act_runner (ns gitea-actions) uses this INSTANCE-level registration
+# token (from POST /api/v1/admin/actions/runners/registration-token) to register once
+# against Gitea. Flux decrypts it via the sops-age key at reconcile (apps Kustomization
+# decryption is wired in clusters/dev/kustomization.yaml). Rotate by resetting the token
+# in Gitea (admin -> actions -> runners) and re-encrypting a fresh value here.
+# Recover/inspect: infra/devcontainer/dev.sh run sops -d apps/gitea-actions-runner-secret.sops.yaml
+apiVersion: v1
+kind: Secret
+metadata:
+    name: gitea-actions-runner
+    namespace: gitea-actions
+    labels:
+        app.kubernetes.io/name: act-runner
+type: Opaque
+stringData:
+    token: ENC[AES256_GCM,data:W48mEtBqGeukX13lMhrhrer+zB21cLVp0acy3m1Xy/oo89DqO8FX/Q==,iv:wfTUU7RiFLdEc1fmEFS9DfE2SmGCFLPK17m0IKspft0=,tag:UhoXA47p7386KHcYNbPzCg==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age175l8mdpdfu7hq0aml3exs3gykarwjmuvr23sq56s3wjejnyk44wsp4mfzg
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBMYjhDVis5UzBvMWdjQUtk
+            T28wRTFZdjB6NFZOYmxQTGpOcksrb2pyK1RNCjZVdnFHU0IvOEcvcmRjZ05SQWI0
+            OTdEekJDYlc3cUxNU29OZU9YWlM5b00KLS0tIEtNeHlrV3NXUnhyNnJncW5vZmta
+            MDZLUE52QzJXbFlrNWxOcVhJbDNnY00KxCpFkbhhCuk4Fa8CC3C4+R9AcsUnaXQR
+            UjAfwKFoXAneXUih7TTXMbR/6+VgQBww5Bmwpn7jVLnzP0N0pIZVTA==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-08-26T04:48:14Z"
+    mac: ENC[AES256_GCM,data:b99/zkL332RIT3FYBa1sR3o9+pwlmrUgKvVHawbjWYSJZ7ERUfO+LXuhKJ0HKrp6i1JfkurZlRO27iBcfrBisAXS9KLaqmsCJf4kKfFc4skANrmKCzprrXUmZexr1uiE8eDUzjNCLNxSCZfnFR6d/AkMXJqi6Hsj9/O+wH2lWsc=,iv:3DIPszSdxK81ERO3o/nTs33qQYHaAKLNcGP4qlZViFc=,tag:/B6VKkzMUwh0byNUicS5wQ==,type:str]
+    pgp: []
+    encrypted_regex: ^(data|stringData)$
+    version: 3.9.4