staging環境ようのgithub actionを作成

.github/workflows/staging.yml

@@ -0,0 +1,50 @@
+name: Build for Staging
+on:
+  push:
+    # branches:
+    #   - main
+  workflow_dispatch:
+
+jobs:
+  app:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out
+        uses: actions/checkout@v3
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: piny940
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          context: ./backend
+          file: ./backend/Dockerfile
+          tags: |
+            ghcr.io/piny940/kintai-backend:main-${{ github.sha }}-${{ github.run_number }}
+  frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out
+        uses: actions/checkout@v3
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: piny940
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          context: ./frontend
+          file: ./frontend/Dockerfile
+          tags: |
+            ghcr.io/piny940/kintai-frontend:main-${{ github.sha }}-${{ github.run_number }}