✨ workflow for building nginx image

.github/workflows/deploy-nginx.yml

@@ -0,0 +1,44 @@
+name: Build&Push Nginx image to GAR
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'docker/nginx/**'
+      - '.github/workflows/deploy-nginx.yaml'
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Google Cloud
+        id: auth
+        uses: google-github-actions/auth@v2
+        with:
+          token_format: access_token
+          workload_identity_provider: 'projects/228944830644/locations/global/workloadIdentityPools/gh-pool/providers/provider-github'
+          service_account: '[email protected]'
+
+      - name: Authorize Docker
+        id: docker-auth
+        uses: docker/login-action@v3
+        with:
+          username: 'oauth2accesstoken'
+          password: ${{ steps.auth.outputs.access_token }}
+          registry: asia-northeast1-docker.pkg.dev
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: asia-northeast1-docker.pkg.dev/lgtmgen-project/dev-main/nginx:latest
+          file: ./docker/nginx/Dockerfile
+          context: ./docker/nginx