Handle "/" in branch names (#3260)

.github/workflows/build-web.yml

@@ -342,7 +342,7 @@ jobs:
         id: image-tag
         run: |
           if [[ $(grep "pull" <<< "${GITHUB_REF}") ]]; then
-            IMAGE_TAG=${GITHUB_HEAD_REF}
+            IMAGE_TAG=$(echo "${GITHUB_HEAD_REF}" | sed "s#/#-#g")
           else
             IMAGE_TAG=$(echo "${GITHUB_REF:11}" | sed "s#/#-#g")
           fi