fix(ci): guard check/build/deploy against unsubstituted template (#6)

.gitea/workflows/cd.yml

@@ -11,8 +11,25 @@ env:
   IMAGE: __PROJECT_NAME__
 
 jobs:
+  guard:
+    name: Detect unsubstituted template
+    runs-on: self-hosted
+    outputs:
+      is_template: ${{ steps.detect.outputs.is_template }}
+    steps:
+      - uses: actions/checkout@v4
+      - id: detect
+        run: |
+          if grep -q '__MODULE_PATH__' go.mod; then
+            echo "is_template=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "is_template=false" >> "$GITHUB_OUTPUT"
+          fi
+
   check:
     name: Lint / Test / Vet
+    needs: guard
+    if: needs.guard.outputs.is_template != 'true'
     runs-on: self-hosted
     steps:
       - uses: actions/checkout@v4
@@ -34,9 +51,9 @@ jobs:
 
   build:
     name: Build & Import
-    needs: check
+    needs: [guard, check]
+    if: needs.guard.outputs.is_template != 'true' && github.event_name != 'pull_request'
     runs-on: self-hosted
-    if: github.event_name != 'pull_request'
     outputs:
       image-tag: ${{ steps.meta.outputs.sha-tag }}
     steps:
@@ -63,9 +80,9 @@ jobs:
 
   deploy:
     name: Deploy via GitOps
-    needs: build
+    needs: [guard, build]
+    if: needs.guard.outputs.is_template != 'true' && github.ref == 'refs/heads/main' && github.event_name == 'push'
     runs-on: self-hosted
-    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
     steps:
       - name: Update image tag in infra repo
         env: