Set USER/WORKDIR at the correct time.

Author: alexreinking

master/Dockerfile

@@ -21,6 +21,9 @@ RUN apt-get update \
 # Non-root user
 RUN useradd --create-home --home-dir /buildbot buildbot
 
+USER buildbot
+WORKDIR /buildbot
+
 # Copy virtual environment from builder
 COPY --from=builder --chown=buildbot:buildbot /buildbot/.venv /buildbot/.venv
 ENV PATH="/buildbot/.venv/bin:$PATH" \
@@ -30,9 +33,6 @@ ENV PATH="/buildbot/.venv/bin:$PATH" \
 COPY --chown=buildbot:buildbot master/ master/
 COPY --chown=buildbot:buildbot master.sh master.sh
 
-USER buildbot
-WORKDIR /buildbot
-
 EXPOSE 8012 9990
 
 ENTRYPOINT ["tini", "--"]