create home dir for appuser

Dockerfile

@@ -12,6 +12,7 @@ COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /go/src/gitlab.switch.ch/memoriav/memobase-2020/services/histogram/bin/app /app
 COPY --from=builder /etc/passwd /etc/passwd
 RUN chmod +x /usr/bin/histogram
+RUN useradd -m appuser
 
 RUN apt-get update && \
 apt-get install -y exiftool ffmpeg imagemagick && \