Fixes an issue with deprecated set-env command

Author: haroon-sheikh

.github/workflows/push-to-registry.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - name: Set env variables
         run: |
-          echo "::set-env name=IMAGE_VERSION::${GITHUB_REF##*/}"
+          echo "IMAGE_VERSION=${GITHUB_REF##*/}" >> $GITHUB_ENV
       - name: Check out the repo
         uses: actions/checkout@v2
       - name: Build base Image