Add an ns1 test-and-deploy workflow for the Go MCP server.

scripts/deploy-138.sh tests with Go 1.26.9, swaps the live binary, and rolls back if port 8000 stops answering. Port 0 in the embedded NATS listener now picks an ephemeral port so the test can run while 4222 is already taken.

.forgejo/workflows/test-and-deploy.yml

@@ -0,0 +1,24 @@
+name: test-and-deploy
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: 138
+    steps:
+      - uses: actions/checkout@v4
+      - name: Unit tests
+        run: bash scripts/test-138.sh
+
+  deploy-138:
+    needs: test
+    if: success() && github.event_name != 'pull_request' && github.ref == 'refs/heads/main'
+    runs-on: 138
+    steps:
+      - uses: actions/checkout@v4
+      - name: Deploy with automatic health rollback
+        run: bash scripts/deploy-138.sh