fix(gitea-runner): use act-compatible images with Docker support

Update Gitea Actions runner to use catthehacker/ubuntu images which
are specifically designed for GitHub Actions/Gitea Actions and include
Docker CLI and common tools pre-installed.

Changes:
- Replace node:20-bullseye labels with catthehacker/ubuntu:act-latest
- Add ubuntu-22.04 label pointing to act-22.04 image
- Configure DOCKER_* environment variables to be passed to jobs

These images are the standard for act (local GitHub Actions runner)
and Gitea Actions, providing better compatibility with workflows
that need Docker access.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

testing1/first-cluster/apps/gitea/runner-deployment.yaml

@@ -43,7 +43,13 @@ spec:
             - name: GITEA_RUNNER_NAME
               value: "kubernetes-runner"
             - name: GITEA_RUNNER_LABELS
-              value: "ubuntu-latest:docker://node:20-bullseye,ubuntu-22.04:docker://node:20-bullseye"
+              value: "ubuntu-latest:docker://catthehacker/ubuntu:act-latest,ubuntu-22.04:docker://catthehacker/ubuntu:act-22.04"
+            - name: GITEA_RUNNER_ENV_DOCKER_HOST
+              value: tcp://localhost:2376
+            - name: GITEA_RUNNER_ENV_DOCKER_CERT_PATH
+              value: /certs/client
+            - name: GITEA_RUNNER_ENV_DOCKER_TLS_VERIFY
+              value: "1"
           volumeMounts:
             - name: docker-certs
               mountPath: /certs