[BUILD][BRANCH] Fix bug on BUILD_BRANCH variable

* The build is always triggered via a parent pipeline in this version
of the CI/CD so it was necessary to fix the condition.

build-pipeline.yml

@@ -51,11 +51,10 @@ workflow:
     - export EULA=1
     - BUILD_BRANCH=${MASTER_BRANCH}
     - |
-       if [ ${CI_PIPELINE_SOURCE} == "pipeline" ]; then
+       if [ ${CI_PIPELINE_SOURCE} == "parent_pipeline" ]; then
             BUILD_BRANCH="${CI_COMMIT_REF_NAME}"
-       elif [ ${CI_PIPELINE_SOURCE} == "schedule" ]; then
-            BUILD_BRANCH="${CI_COMMIT_BRANCH}"
-       elif [ ! -z ${CI_COMMIT_TAG} ]; then
+       fi
+       if [ ! -z ${CI_COMMIT_TAG} ]; then
             BUILD_BRANCH="refs/tags/${CI_COMMIT_TAG}"
        fi
        echo "This is the manifest repository URL used for the build: ${CI_REPOSITORY_URL}"