use find-latest-tag@v1

.github/workflows/main.yml

@@ -24,17 +24,19 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_TOKEN }}
-      - name: Set output
-        id: vars
-        run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
-      - name: Check output
-        env:
-          RELEASE_VERSION: ${{ steps.vars.outputs.tag }}
+
+      - 
+        name: Get latest tag
+        uses: oprypin/find-latest-tag@v1
+        with:
+          repository: moficodes/ibmcloud-kubernetes-admin  # The repository to scan.
+          releases-only: true  # We know that all relevant tags have a GitHub release for them.
+        id: tag  # The step ID to refer to later.
       -
         name: build-and-push-kubeadmin
         uses: docker/build-push-action@v2
         with:
           file: docker/Dockerfile.Web
           context: .
           push: true
-          tags: ${{ secrets.DOCKER_USERNAME }}/kubeadmin:${{ RELEASE_VERSION }}
+          tags: ${{ secrets.DOCKER_USERNAME }}/kubeadmin:${{ steps.tag.outputs.tag }}