try this

Author: jeroen

debian-11-ppc64/Dockerfile

@@ -17,14 +17,16 @@ RUN apt-get update -y && \
 
 RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools
 
-#ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
 ENV GCLIENT_PY3=1
 
 RUN yes | fetch --nohooks v8
 
 WORKDIR /v8
 
-RUN gclient sync --nohooks -D --force --reset && \
+RUN git branch build ${version} &&\
+	git checkout build &&\
+	gclient sync --nohooks -D --force --reset && \
 	gclient sync --revision ${version}
 
 RUN gn gen ${target} -vv --fail-on-unused-args \