Includes the following fixes:
- Fix cron entry format for clean-up script.
Crontabs in `/etc` should not have a user field. No idea why it used
to work before, but it started giving errors recently:
`/bin/sh: root: not found`.
- Set required env variable in clean-up script. (Broken in cc6f36a9d.)
This was producing the following error:
`ERROR: Missing required environment variable 'AIO_CIRCLE_CI_TOKEN'!`
- Use the correct path for downloads to be removed. (Broken in cc6f36a9d.)
PR Close#25671
closes#19352
Previously, the upload server (for PR previews) was run as root and
"downleveled" to a non-privileged user from inside the node script.
Now, with the latest version of `pm2` (which is used to run the upload server
scripts), we can get rid of that workaround and set the desired UID directly
through `pm2`.
This commit introduces the ability to show previews for PRs by any author. It works as follows:
- The build artifacts of all PRs are uploaded to the preview server.
- Automatically verified PRs (i.e. from trusted authors or having a specific label) are deployed and
publicly accessible as usual.
- PRs that could not be automatically verified are stored for later use (after re-verification).
- A PR can be marked as "trusted" and make its preview publicly accessible by adding the GitHub
label specified in the `AIO_TRUSTED_PR_LABEL` env var of the preview server.
At the moment, there is no automatic mechanism for notifying the preview server about changes to the
PR's verification status. The PR's "visibility" will be checked and updated every time a new build
is uploaded.
