ci: publish to ghcr instead of docker hub

.github/workflows/docker.yml

@@ -13,13 +13,14 @@ on:
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 permissions:
   contents: read
+  packages: write
 
 jobs:
   release:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
@@ -32,14 +33,15 @@ jobs:
       - name: Login to Docker Hub
         uses: docker/login-action@v2
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v4
         with:
-          images: nodebb/docker
+          images: ghcr.io/${{ github.repository }}
           tags: |
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}