Some fixes to make CI work.

.github/workflows/ci.yaml

@@ -22,7 +22,10 @@ jobs:
  docker exec -w /workspace/quic/src/owt $container_id git checkout FETCH_HEAD
  docker exec -w /workspace/quic/src/owt $container_id git rev-parse HEAD >> git_sha.out
  git_sha="$(cat git_sha.out)"
- echo "::set-output name=git_sha::$git_sha"
+ echo "git_sha=$git_sha" >> $GITHUB_OUTPUT
+ # The line below can be removed once docker image is updated.
+ docker exec $container_id apt-get update
+ docker exec $container_id apt-get install -y ninja-build
  docker exec $container_id python3 owt/test/scripts/build.py
  docker cp $container_id:/workspace/quic/packages/$git_sha.zip .
  docker stop $container_id

web_transport/docker/Dockerfile

@@ -9,7 +9,8 @@
 FROM ubuntu:20.04
 SHELL ["/bin/bash", "-c"]
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install -y git curl wget python lsb-release tzdata
+ENV TAR_OPTIONS="--no-same-owner"
+RUN apt-get update && apt-get install -y git curl wget python lsb-release tzdata ninja-build
 RUN mkdir workspace
 WORKDIR /workspace
 RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git