ci: build and push Docker image

.dockerignore

@@ -3,3 +3,4 @@ node_modules
 .gitignore
 Dockerfile
 .env
+.github

.github/workflows/docker.yaml

@@ -0,0 +1,39 @@
+name: Build Docker image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: |
+            ghcr.io/ludovicm67/mongodb-check-slack:latest
+            ghcr.io/ludovicm67/mongodb-check-slack:main