Fix: Move DOCKER_HOST to runner.envs (not container.env)

The act_runner config uses runner.envs for job environment variables,
not container.env which doesn't exist.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

argocd/manifests/forgejo-runner/configmap.yaml

@@ -12,12 +12,12 @@ data:
       file: /data/.runner
       capacity: 2
       timeout: 3h
+      # Set DOCKER_HOST in job containers so they can run docker commands
+      envs:
+        DOCKER_HOST: tcp://127.0.0.1:2375
 
     container:
       # Use our custom job execution image with Node.js + Docker CLI
       network: "host"
       # Connect to DinD sidecar via TCP (not socket)
       docker_host: tcp://127.0.0.1:2375
-      # Set DOCKER_HOST in job containers so they can run docker commands
-      env:
-        DOCKER_HOST: tcp://127.0.0.1:2375