Fix runner: use explicit register + daemon with --config flag

The act_runner entrypoint ignores CONFIG_FILE for the daemon
command, so container.options (pnpm cache volume) never loads.
Use a custom command that registers manually then runs daemon
with --config explicitly.

infra/kubernetes/platform/gitea-runner/deployment.yaml

@@ -18,9 +18,21 @@ spec:
       containers:
         - name: runner
           image: gitea/act_runner:latest
+          command:
+            - sh
+            - -c
+            - |
+              if [ ! -f /data/.runner ]; then
+                act_runner register \
+                  --instance "$GITEA_INSTANCE_URL" \
+                  --token "$GITEA_RUNNER_REGISTRATION_TOKEN" \
+                  --labels "$GITEA_RUNNER_LABELS" \
+                  --config /config/config.yaml \
+                  --no-interactive
+              fi
+              exec act_runner daemon --config /config/config.yaml
+          workingDir: /data
           env:
-            - name: CONFIG_FILE
-              value: /config/config.yaml
             - name: GITEA_INSTANCE_URL
               value: http://gitea-helm-http.platform.svc:3000
             - name: GITEA_RUNNER_REGISTRATION_TOKEN