[7.1.0] Set RC branch when creating GitHub releases (#21477)

Commit
748e18a

PiperOrigin-RevId: 609523222
Change-Id: I34b6ae7d497b69f64f80a54614a52fcf321d47e6

Co-authored-by: Googler <keerthanakumar@google.com>

scripts/ci/build.sh

@@ -147,14 +147,15 @@ function release_to_github() {
   local release_name=$(get_release_name)
   local rc=$(get_release_candidate)
   local full_release_name=$(get_full_release_name)
+  local release_branch=$(get_release_branch)
 
   if [ -n "${release_name}" ]; then
     local github_token="$(gsutil cat gs://bazel-trusted-encrypted-secrets/github-trusted-token.enc | \
         gcloud kms decrypt --project bazel-public --location global --keyring buildkite --key github-trusted-token --ciphertext-file - --plaintext-file -)"
     if [ -z "${rc}" ]; then
       GITHUB_TOKEN="${github_token}" github-release "bazelbuild/bazel" "${release_name}" "" "$(get_release_page)" "${artifact_dir}/*"
     else
-      GITHUB_TOKEN="${github_token}" github-release -prerelease "bazelbuild/bazel" "${full_release_name}" "" "$(get_release_page)" "${artifact_dir}/*"
+      GITHUB_TOKEN="${github_token}" github-release -prerelease "bazelbuild/bazel" "${full_release_name}" "${release_branch}" "$(get_release_page)" "${artifact_dir}/*"
     fi
   fi
 }