Update docker-publish.yml

Changed it so it pushed to ghrc.io instead of the old packages server

.github/workflows/docker-publish.yml

@@ -13,10 +13,6 @@ on:
   # Run tests for any PRs.
   pull_request:
 
-env:
-  # TODO: Change variable to your image's name.
-  IMAGE_NAME: hockeypuck
-
 jobs:
   # Run tests.
   # See also https://docs.docker.com/docker-hub/builds/automated-testing/
@@ -43,13 +39,17 @@ jobs:
 
       - name: Build image
         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
+
+      - name: Login to ghcr.io
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Push image
         run: |
-          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME
+          IMAGE_ID=ghcr.io/${{ github.repository }}
 
           # Change all uppercase to lowercase
           IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')