Deploy images to both dockerhub and ghcr (#2051)

Co-authored-by: Geoff Bourne <itzgeoff@gmail.com>

Author: camalot

.github/workflows/build-multiarch.yml

@@ -113,14 +113,16 @@ jobs:
           # then the use of ${{ github.repository_owner }} will need to be replaced.
           images: |
             ${{ github.repository_owner }}/minecraft-server
+            ghcr.io/${{ github.repository_owner }}/minecraft-server
           tags: |
-            type=ref,event=tag,enable=${{ matrix.variant == 'java17' }}
+            type=ref,event=tag,enable=${{ matrix.variant == 'java17' && github.ref == 'master' }}
             type=ref,event=tag,suffix=-${{ matrix.variant }}
-            type=raw,value=${{ matrix.variant }}
+            type=ref,event=branch,suffix=-${{ matrix.variant }},enable=${{ github.ref != 'master' }}
+            type=raw,value=${{ matrix.variant }},enable=${{ github.ref == 'master' }}
           # NOTE this identifies which variant will be published as "latest", which isn't
           # necessarily the newest version of Java
           flavor: |
-            latest=${{ matrix.variant == 'java17' }}
+            latest=${{ matrix.variant == 'java17' && github.ref == 'master' }}
           labels: |
             org.opencontainers.image.authors=Geoff Bourne <itzgeoff@gmail.com>
 
@@ -150,6 +152,7 @@ jobs:
           MINECRAFT_VERSION: ${{ matrix.mcVersion }}
           VARIANT: ${{ matrix.variant }}
           MODS_FORGEAPI_KEY: ${{ secrets.MODS_FORGEAPI_KEY }}
+          CF_API_KEY: ${{ secrets.MODS_FORGEAPI_KEY }}
         run: |
           tests/test.sh
 
@@ -160,6 +163,14 @@ jobs:
           username: ${{ secrets.DOCKER_USER }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
+      - name: Login to GHCR
+        uses: docker/login-action@v2
+        if: env.HAS_IMAGE_REPO_ACCESS
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
       - name: Build and push
         uses: docker/build-push-action@v3.3.0
         if: github.actor == github.repository_owner
@@ -168,7 +179,8 @@ jobs:
           push: >
             ${{ 
             github.ref_type == 'tag' 
-            || github.ref_name == 'master' 
+            || github.ref_name == 'master'
+            || startsWith(github.ref_name, 'test/')
             || ( github.event_name == 'pull_request' 
                  && env.HAS_IMAGE_REPO_ACCESS 
                  && contains(github.event.pull_request.labels.*.name, 'ci/push-image')