CI: Ensure Docker runs + publishes images only on stable releases (#6839)

* Update docker-release.yml

* Update docker-release.yml

* Update docker-release.yml

* Update docker-release.yml

* Update docker-release.yml

.github/workflows/docker-release.yml

@@ -1,9 +1,10 @@
 name: Build Docker Image
 
 on:
+  release:
+    types:
+      - released    # publishing of stable releases
   push:
-    tags:
-      - '*Release*'
     branches:
       - master
   pull_request:
@@ -16,16 +17,18 @@ on:
 # Cancel earlier, unfinished runs of this workflow on the same branch (unless on release)
 concurrency:
   group: "${{ github.workflow }} @ ${{ github.ref_name }}"
-  cancel-in-progress: ${{ github.ref_type != 'tag' }}
+  cancel-in-progress: ${{ github.event_name != 'release' }}
 
 jobs:
   docker:
     name: amd64 & arm64
+    if: ${{ github.repository_owner == 'Cockatrice' }}
     runs-on: ubuntu-latest
+
     permissions:
       contents: read
       packages: write
-
+  
     steps:
       - name: Checkout
         uses: actions/checkout@v6
@@ -52,7 +55,7 @@ jobs:
         uses: docker/setup-buildx-action@v4
 
       - name: Login to GitHub Container Registry
-        if: github.ref_type == 'tag'
+        if: contains(github.event.release.tag_name, 'Release') && github.event.release.target_commitish == 'master'
         uses: docker/login-action@v4
         with:
           registry: ghcr.io