Add push to ghcr for docker image

Author: tobi1449

.github/workflows/ci.yml

@@ -1,5 +1,8 @@
 name: Node.js CI - Dockge
 
+env:
+  IMAGE_NAME: Dockge
+
 on:
   push:
     branches: [master]
@@ -59,5 +62,22 @@ jobs:
 
       - name: Build
         run: pnpm run build:frontend
-      # more things can be add later like tests etc..
+
+      - name: Build image
+        run: docker build . --file docker/Dockerfile --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"
+        
+      - name: Log in to registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Push image
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          [ "$VERSION" == "main" ] && VERSION=latest
+          echo IMAGE_ID=$IMAGE_ID
+          echo VERSION=$VERSION
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION