update the select branch name policy

build-bin/maven/maven_release

@@ -26,9 +26,17 @@ export MAVEN_OPTS="$($(dirname "$0")/maven_opts)"
 trigger_tag=${1?trigger_tag is required. Ex release-1.2.3}
 release_version=$(build-bin/git/version_from_trigger_tag release- ${trigger_tag})
 
-# Checkout the tag to release
+# Checkout the branch that triggered this build
 git fetch --tags origin
-git checkout ${trigger_tag}
+commit_sha=$(git rev-parse "$trigger_tag")
+branches=$(git branch --contains "$commit_sha")
+branch_name=$(echo "$branches" | head -n 1 | awk '{print $2}')
+if [ -z "$branch_name" ]; then
+  default_branch="master"
+  echo "Unable to determine a valid branch. Auto-selecting the default branch: $default_branch"
+  branch_name=$default_branch
+fi
+git checkout "$branch_name"
 
 # Prepare and push release commits and the version tag (N.N.N), which triggers deployment.
 ./mvnw --batch-mode -nsu -DreleaseVersion=${release_version} -Denforcer.fail=false -Darguments="-DskipTests -Denforcer.fail=false" release:prepare