Quote the subcommand to fix lint

Author: Daniel Lyne

.github/workflows/server-release.yml

@@ -77,7 +77,7 @@ jobs:
       - name: Derive Version Numbers
         run: |
           export REPO="${{ secrets.DOCKERHUB_USERNAME }}/svix-server"
-          echo DOCKER_TAGS=$(echo "${{ github.event.release.tag_name }}" | sed -E "s#v([0-9]+)\.([0-9]+)\.([0-9]+)#${REPO}:latest,${REPO}:v\1.\2.\3,${REPO}:v\1.\2,${REPO}:v\1#") >> "$GITHUB_ENV"
+          echo DOCKER_TAGS="$(echo "${{ github.event.release.tag_name }}" | sed -E "s#v([0-9]+)\.([0-9]+)\.([0-9]+)#${REPO}:latest,${REPO}:v\1.\2.\3,${REPO}:v\1.\2,${REPO}:v\1#")" >> "$GITHUB_ENV"
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v2