Upgrade k8s forgejo-runner daemon from v6.3.1 to v12.7.0

Completes the upgrade-k8s-runner mikado chain. Both prerequisites
(workflow validation and config review) were resolved in #250.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

argocd/manifests/forgejo-runner/deployment.yaml

@@ -18,7 +18,7 @@ spec:
       containers:
         # Forgejo runner daemon
         - name: runner
-          image: code.forgejo.org/forgejo/runner:6.3.1
+          image: code.forgejo.org/forgejo/runner:12.7.0
           env:
             - name: TZ
               value: America/Los_Angeles

docs/changelog.d/upgrade-k8s-runner-v12.infra.md

@@ -0,0 +1 @@
+Upgrade k8s forgejo-runner daemon from v6.3.1 to v12.7.0

docs/how-to/forgejo-runner/upgrade-k8s-runner.md

@@ -1,6 +1,5 @@
 ---
 title: Upgrade K8s Forgejo Runner to v12
-status: active
 requires:
   - validate-workflows-against-v12
   - review-runner-config-v12

service-versions.yaml

@@ -187,7 +187,7 @@ services:
   - name: forgejo-runner
     type: argocd
     last-reviewed: 2026-02-22
-    current-version: "6.3.1"
+    current-version: "12.7.0"
     upstream-source: https://code.forgejo.org/forgejo/runner/releases
     notes: >-
       Runner daemon version. Job execution container (containers/forgejo-runner)