oauth2-proxy on Cloud Run

Dockerfile

FROM alpine:3.13
WORKDIR /opt/draft-proxy
RUN apk update && apk add git curl
RUN curl -L -o package.tgz https://github.com/oauth2-proxy/oauth2-proxy/releases/download/v6.1.1/oauth2-proxy-v6.1.1.linux-amd64.tar.gz && \
               tar xvzf package.tgz && \
               mv oauth2-proxy-*.linux-amd64/oauth2-proxy .
CMD ["./oauth2-proxy", \
     "--provider=github", "--github-org=YOUR_GITHUB_ORG", "--email-domain=*", \
     "--http-address=0.0.0.0:8080", \
     "--reverse-proxy=true", \
     "--upstream=https://YOUR_DRAFT_SITE_DOMAIN/", \
     "--pass-host-header=false", \
     "--redirect-url=https://CNAME_FOR_YOUR_DRAFT_SITE/oauth2/callback", \
     "--client-id=GITHUB_APP_CLIENT_ID", \
     "--client-secret=GITHUB_APP_CLIENT_SECRET", \
     "--cookie-secret=RANDOM_STRING_OF_LENGTH_32"]