Migrate to GHCR

.github/workflows/docker-publish.yml

@@ -10,15 +10,16 @@ on:
     tags:
       - v*
 
-  # Run tests for any PRs.
+  # Run tests for all PRs to master and develop.
   pull_request:
+    branches:
+      - master
+      - develop
 
 env:
   IMAGE_NAME: mermaid-live-editor
 
 jobs:
-  # Run tests.
-  # See also https://docs.docker.com/docker-hub/builds/automated-testing/
   test:
     runs-on: ubuntu-latest
 
@@ -29,8 +30,6 @@ jobs:
         run: |
           docker build . --file Dockerfile
 
-  # Push image to GitHub Packages.
-  # See also https://docs.docker.com/docker-hub/builds/
   push:
     # Ensure test job passes before pushing image.
     needs: test
@@ -45,11 +44,11 @@ jobs:
         run: docker build . --file Dockerfile --tag $IMAGE_NAME
 
       - name: Log into registry
-        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
 
       - name: Push image
         run: |
-          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
 
           # Change all uppercase to lowercase
           IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')