Should fix namespace issue.

Credit goes to @stenongithub <-- https://github.com/stenongithub/gitlab-mirror-and-ci-action/blob/master/entrypoint.sh

entrypoint.sh

@@ -7,7 +7,8 @@ POLL_TIMEOUT=${POLL_TIMEOUT:-$DEFAULT_POLL_TIMEOUT}
 
 git checkout "${GITHUB_REF:11}"
 
-branch=${GITHUB_REPOSITORY}/$(git symbolic-ref --short HEAD)
+branch="$(git symbolic-ref --short HEAD)"
+branch_uri="$(urlencode ${branch})"
 
 sh -c "git config --global credential.username $GITLAB_USERNAME"
 sh -c "git config --global core.askPass /cred-helper.sh"
@@ -18,10 +19,7 @@ sh -c "git push mirror $branch"
 
 sleep $POLL_TIMEOUT
 
-# convert slashes in a HTML-compatible way
-branch=${branch//\//%2F}
-
-pipeline_id=$(curl --header "PRIVATE-TOKEN: $GITLAB_PASSWORD" --silent "https://${GITLAB_HOSTNAME}/api/v4/projects/${GITLAB_PROJECT_ID}/repository/commits/${branch}" | jq '.last_pipeline.id')
+pipeline_id=$(curl --header "PRIVATE-TOKEN: $GITLAB_PASSWORD" --silent "https://${GITLAB_HOSTNAME}/api/v4/projects/${GITLAB_PROJECT_ID}/repository/commits/${branch_uri}" | jq '.last_pipeline.id')
 
 echo "Triggered CI for branch ${branch}"
 echo "Working with pipeline id #${pipeline_id}"