feat: add CI staging workflow for non-main branches

Author: CHAFAH

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI - Staging
+
+on:
+  push:
+    branches-ignore: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - run: corepack enable && corepack prepare pnpm@10.33.0 --activate
+      - run: pnpm install --no-frozen-lockfile
+      - run: pnpm build
+      - run: pnpm test
+
+  docker:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v2
+      - uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+      - uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: |
+            chafah/nodejs-app:${{ github.ref_name }}-staging
+            chafah/nodejs-app:staging