chore: push image to ghcr, too

.github/workflows/docker.yml

@@ -13,6 +13,8 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      packages: write
 
     environment:
       name: Production
@@ -30,9 +32,18 @@ jobs:
         username: ${{ secrets.DOCKERHUB_USERNAME }}
         password: ${{ secrets.DOCKERHUB_TOKEN }}
 
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
     - name: Build and push Docker image
       uses: docker/build-push-action@v6
       with:
         context: .
         push: true
-        tags: freqtradeorg/frequi:latest
+        tags: |
+          freqtradeorg/frequi:latest
+          ghcr.io/freqtrade/frequi:latest