CI: add build workflow + run docker workflow only if secrets are set

.github/workflows/build.yaml

@@ -0,0 +1,25 @@
+name: Check build
+
+on: [push, pull_request]
+
+jobs:
+  build-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run build check
+        run: |
+          npm run build
+          npm run build:pwa

.github/workflows/docker.yaml

@@ -8,7 +8,23 @@ on:
     types: [released]
 
 jobs:
+  check-secrets:
+    runs-on: ubuntu-latest
+    outputs:
+      secrets_set: ${{ steps.check.outputs.secrets_set }}
+    steps:
+      - name: Check if secrets are set
+        run: |
+          if [ -z "${{ secrets.DOCKER_USERNAME }}" ]; then
+            echo "secrets_set=false" >> $GITHUB_OUTPUT
+          else
+            echo "secrets_set=true" >> $GITHUB_OUTPUT
+          fi
+
   build-and-push:
+    # run only when secrets are set
+    needs: check-secrets
+    if: ${{ needs.check-secrets.outputs.secrets_set == 'true' }}
     runs-on: ubuntu-latest
     steps:
       - name: Checkout

.github/workflows/format.yaml

@@ -14,6 +14,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: "20"
+          cache: "npm"
 
       - name: Install dependencies
         run: npm install