Pass CI branch parameter to build scan

See gh-19658

ci/pipeline.yml

@@ -210,6 +210,7 @@ jobs:
       image: spring-boot-ci-image
       file: git-repo/ci/tasks/build-project.yml
       params:
+        BRANCH: ((branch))
         GRADLE_ENTERPRISE_ACCESS_KEY: ((gradle_enterprise_secret_access_key))
         GRADLE_ENTERPRISE_CACHE_USER: ((gradle_enterprise_cache_user.username))
         GRADLE_ENTERPRISE_CACHE_PASSWORD: ((gradle_enterprise_cache_user.password))
@@ -299,6 +300,7 @@ jobs:
       image: spring-boot-jdk11-ci-image
       file: git-repo/ci/tasks/build-project.yml
       params:
+        BRANCH: ((branch))
         GRADLE_ENTERPRISE_ACCESS_KEY: ((gradle_enterprise_secret_access_key))
         GRADLE_ENTERPRISE_CACHE_USER: ((gradle_enterprise_cache_user.username))
         GRADLE_ENTERPRISE_CACHE_PASSWORD: ((gradle_enterprise_cache_user.password))
@@ -336,6 +338,7 @@ jobs:
         image: spring-boot-jdk13-ci-image
         file: git-repo/ci/tasks/build-project.yml
         params:
+          BRANCH: ((branch))
           GRADLE_ENTERPRISE_ACCESS_KEY: ((gradle_enterprise_secret_access_key))
           GRADLE_ENTERPRISE_CACHE_USER: ((gradle_enterprise_cache_user.username))
           GRADLE_ENTERPRISE_CACHE_PASSWORD: ((gradle_enterprise_cache_user.password))

ci/tasks/build-project.yml

@@ -9,6 +9,7 @@ caches:
 - path: gradle
 - path: embedmongo
 params:
+  BRANCH:
   CI: true
   GRADLE_ENTERPRISE_ACCESS_KEY:
   GRADLE_ENTERPRISE_CACHE_USERNAME:

gradle/build-scan-user-data.gradle

@@ -27,7 +27,7 @@ void tagCiOrLocal() {
 void addGitMetadata() {
 	gradleEnterprise.buildScan.background {
 		def gitCommitId = execAndGetStdout('git', 'rev-parse', '--short=8', '--verify', 'HEAD')
-		def gitBranchName = execAndGetStdout('git', 'rev-parse', '--abbrev-ref', 'HEAD')
+		def gitBranchName = getBranch()
 		def gitStatus = execAndGetStdout('git', 'status', '--porcelain')
 
 		if(gitCommitId) {
@@ -50,6 +50,14 @@ boolean isCi() {
 	System.getenv('CI')
 }
 
+String getBranch() {
+	def branch = System.getenv('BRANCH')
+	if (branch != null && !branch.isEmpty()) {
+		return branch
+	}
+	return execAndGetStdout('git', 'rev-parse', '--abbrev-ref', 'HEAD')
+}
+
 String execAndGetStdout(String... args) {
 	def stdout = new ByteArrayOutputStream()
 	exec {