Docker: Add Docker image tag for major/minor version

See #82

.github/workflows/build-docker.yml

@@ -22,6 +22,13 @@ jobs:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
 
+    - name: Parse semver
+      id: semver_parser 
+      uses: booxmedialtd/ws-action-parse-semver@v1
+      with:
+        input_string: '${{ github.ref_name }}'
+        version_extractor_regex: 'v(.*)$'
+
     - name: Build and push
       uses: docker/build-push-action@v4
       with:
@@ -31,4 +38,7 @@ jobs:
         build-args: |
           "VERSION=${{ github.ref_name }}"
         push: true
-        tags: axllent/mailpit:latest,axllent/mailpit:${{ github.ref_name }}
+        tags: |
+          axllent/mailpit:latest
+          axllent/mailpit:${{ github.ref_name }}
+          axllent/mailpit:v${{ steps.semver_parser.outputs.major }}.${{ steps.semver_parser.outputs.minor }}