chore: refine Docker image tagging strategy for releases (#10)

* chore: refine Docker image tagging strategy for releases

* chore: restrict full version tag to non-prerelease versions

* chore: update workflow to trigger on release events

Author: diomalta

.github/workflows/docker.yml

@@ -1,8 +1,8 @@
 name: Docker Image
 
 on:
-  push:
-    tags: ['v*.*.*']
+  release:
+    types: [published]
 
 jobs:
   docker:
@@ -19,11 +19,11 @@ jobs:
         with:
           images: ${{ github.repository }}
           flavor: |
-            latest=true
+            latest=${{ !github.event.release.prerelease }}
           tags: |
+            type=semver,pattern={{major}}.{{minor}},enable=${{ !github.event.release.prerelease }}
+            type=semver,pattern={{major}},enable=${{ !github.event.release.prerelease }}
             type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=semver,pattern={{major}}
             type=sha,format=short
 
       - name: Set up QEMU 🦆