ci: add action to publish docker image

.github/actions/dockerpublish.yml

@@ -0,0 +1,53 @@
+name: Docker
+
+on:
+  repository_dispatch:
+    types: publish-latest
+  workflow_dispatch:
+    inputs:
+      reason:
+        description: 'Reason'
+        required: false
+        default: 'Manual trigger'
+  push:
+    # Publish `master` as Docker `latest` image.
+    branches:
+      - master
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: cds-backup
+
+jobs:
+  push:
+
+    name: Publish images
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Extract GIT metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}}
+            # set latest tag for default branch (master)
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and publish image
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -1,3 +1,3 @@
-FROM nginx:1.18
+FROM nginx:latest
 
 COPY . /usr/share/nginx/html