fix where we get base docker image from
# Dockerized OneFuzz CLI
-FROM ubuntu:20.04 AS installer-env
+FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:20.04 AS installer-env
# Pull Request that contains OneFuzz release-artifacts
# used to create the Docker container
@@ -32,7 +32,7 @@ RUN python3 /onefuzz-prep/github_client.py --destination /onefuzz-prep/ --pr ${P
unzip /onefuzz-prep/release-artifacts.zip -d /onefuzz-prep
-FROM ubuntu:20.04
+FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:20.04
COPY --from=installer-env ["/onefuzz-prep/sdk", "/onefuzz-sdk"]
COPY --from=installer-env ["/azcopy_linux_amd64_*/azcopy", "/usr/bin"]
