ca0fcd6c08
Currently, the non forked PRs such as Renovate will run `publish_snapshot` because `CIRCLE_PR_NUMBER` is not defined for PRs which are opened from non forked repos. Instead we add a filter to only run `publish_snapshot` on releasable branches. Example of run were the mentioned variable is not defined https://app.circleci.com/pipelines/github/angular/angular/32093/workflows/7c8c4cfc-e6f6-44fc-a6dc-a82a6ac862db/jobs/976611 PR Close #41877
Encryption
Based on https://github.com/circleci/encrypted-files
In the CircleCI web UI, we have a secret variable called KEY
https://circleci.com/gh/angular/angular/edit#env-vars
which is only exposed to non-fork builds
(see "Pass secrets to builds from forked pull requests" under
https://circleci.com/gh/angular/angular/edit#advanced-settings)
We use this as a symmetric AES encryption key to encrypt tokens like a GitHub token that enables publishing snapshots.
To create the github_token file, we take this approach:
- Find the angular-builds:token in the internal pw database
- Go inside the CircleCI default docker image so you use the same version of openssl as we will at runtime:
docker run --rm -it circleci/node:10.12 - echo "https://[token]:@github.com" > credentials
- openssl aes-256-cbc -e -in credentials -out .circleci/github_token -k $KEY
- If needed, base64-encode the result so you can copy-paste it out of docker:
base64 github_token