ci: deploy to the local stack over the runner socket, not SSH

The runner lives on the deploy host and shares its docker daemon, so the
deploy job runs `docker compose pull && up -d` against the central compose
via a bind-mounted compose dir (docker:cli + docker_host: "-") instead of
appleboy/ssh-action. Drops the SSH_* secrets and recreates only the two
mangalord services at the freshly built SHA. Requires /mnt/ssd/docker-data
in the runner's container.valid_volumes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -124,28 +124,31 @@ jobs:
     runs-on: ubuntu-latest
     needs: build-and-push
     if: github.event_name != 'pull_request'
+    # Single-host deploy: the runner lives on the same box as the stack, so we
+    # drive the host docker daemon directly (act_runner shares its socket via
+    # `docker_host: "-"`) instead of SSHing out. The compose dir is bind-mounted
+    # at its REAL host path so compose's relative bind-mounts (./mangalord/...,
+    # ./Caddyfile) resolve; this requires `/mnt/ssd/docker-data` in the runner's
+    # container.valid_volumes. The central compose references the images as
+    # registry.mc02.dev/mangalord-*:${MANGALORD_TAG:-latest}, so we only pull
+    # and recreate the two mangalord services at the freshly built SHA.
+    container:
+      image: docker:cli
+      volumes:
+        - /mnt/ssd/docker-data:/mnt/ssd/docker-data
     steps:
-      - name: SSH deploy
+      - name: Deploy to the local stack
-        uses: appleboy/ssh-action@v1.0.3
+        working-directory: /mnt/ssd/docker-data
-        with:
-          host: ${{ secrets.SSH_HOST }}
-          username: ${{ secrets.SSH_USER }}
-          key: ${{ secrets.SSH_PRIVATE_KEY }}
-          port: ${{ secrets.SSH_PORT || 22 }}
-          envs: REGISTRY_URL,REGISTRY_USERNAME,REGISTRY_PASSWORD,IMAGE_TAG,DEPLOY_PATH
-          script_stop: true
-          script: |
-            set -euo pipefail
-            cd "$DEPLOY_PATH"
-            echo "$REGISTRY_PASSWORD" | docker login "$REGISTRY_URL" -u "$REGISTRY_USERNAME" --password-stdin
-            export REGISTRY_URL IMAGE_TAG
-            docker compose -f docker-compose.yml -f docker-compose.prod.yml pull
-            docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d
-            docker image prune -f
-            docker logout "$REGISTRY_URL"
         env:
           REGISTRY_URL: ${{ secrets.REGISTRY_URL }}
           REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
           REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
           IMAGE_TAG: ${{ needs.build-and-push.outputs.image_tag }}
-          DEPLOY_PATH: ${{ vars.DEPLOY_PATH }}
+        run: |
+          set -eu
+          echo "$REGISTRY_PASSWORD" | docker login "$REGISTRY_URL" -u "$REGISTRY_USERNAME" --password-stdin
+          export MANGALORD_TAG="$IMAGE_TAG"
+          docker compose pull mangalord-backend mangalord-frontend
+          docker compose up -d mangalord-backend mangalord-frontend
+          docker image prune -f
+          docker logout "$REGISTRY_URL"