update tagging to YY.MM

Author: nmvalera

.github/workflows/release.yml

@@ -19,10 +19,10 @@ jobs:
         run: |
           REF=${{ github.ref }}
           echo ::set-output name=image_tag::$(echo $REF | sed 's/refs\/tags\/v//g')
-          echo ::set-output name=image_tag_minor_latest::$(echo $REF | sed -e 's/refs\/tags\/v//g' -e 's/\.[[:digit:]]$/-latest/g') 
+          echo ::set-output name=image_tag_minor_latest::$(echo $REF | sed -e 's/refs\/tags\/v//g' -e 's/^\([[:digit:]]*\.[[:digit:]]*\).*/\1/') 
       - name: 'Build and publish to Docker Hub'
         uses: docker/build-push-action@v1
-        with:
+        with: 
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
           repository: ${{ secrets.DOCKER_REPO }}