Simplify release script, using releases over tags

Author: coenjacobs

.github/workflows/release.yml

@@ -1,9 +1,6 @@
 name: Publish release to Docker Hub
 
-on:
-  push:
-    tags:
-      - "*.*.*"
+on: release
 
 jobs:
   docker:
@@ -16,14 +13,8 @@ jobs:
         id: prep
         run: |
           DOCKER_IMAGE=coenjacobs/mozart
-          VERSION=latest
-          if [[ $GITHUB_REF == refs/tags/* ]]; then
-            VERSION=${GITHUB_REF#refs/tags/v}
-          fi
+          VERSION=${{ github.event.release.tag_name }}
           TAGS="${DOCKER_IMAGE}:${VERSION}"
-          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
-            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
-          fi
           echo ::set-output name=tags::${TAGS}
 
       - name: Set up QEMU