[BUILD BRANCH] Change rule in triggered on schedule build

* This change allows to build on schedule not only on the MASTER_BRANCH
but also on different branches (those on which the schedule is
programmed)

manifest-pipeline-yocto.yml

@@ -192,6 +192,9 @@ retrigger:
          if [ ${CI_PIPELINE_SOURCE} == "pipeline" ]; then
             BUILD_BRANCH="${CI_COMMIT_REF_NAME}"
          fi
+         if [ ${CI_PIPELINE_SOURCE} == "schedule" ]; then
+            BUILD_BRANCH="${CI_COMMIT_BRANCH}"
+         fi
          echo "This is the manifest repository URL used for the build: ${CI_REPOSITORY_URL}"
          echo "This is the manifest branch used for the build: ${BUILD_BRANCH}"
          echo "This is the board for which the build will be performed: ${BOARD}"