ci: Create docker.yml

.github/workflows/docker.yml

@@ -0,0 +1,36 @@
+name: Build Docker Image
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+    - uses: actions/checkout@v4
+
+    - 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: Docker Build & Push
+      uses: docker/build-push-action@v6
+      env:
+        DOCKER_BUILD_NO_SUMMARY: true
+      with:
+        context: .
+        file: Dockerfile
+        platforms: linux/amd64
+        push: true
+        sbom: false
+        tags: ghcr.io/ietf-tools/grafana:latest