Electron Releases

Description of Change

Three CI steps fetch over the network with no retry, and each has failed builds on main with errors that pass on a re-run:

• the test job's Get Depot Tools clone from googlesource.com
• Install Build Tools: npm i -g @electron/build-tools, then the depot_tools clone that the first e command performs (fatal: fetch-pack: invalid index-pack output)
• Fixup angle git in the fix-sync action, a large git fetch from github.com (error: RPC failed; curl 56 Recv failure: Operation timed out, e.g. https://github.com/electron/electron/actions/runs/33782849304/job/100741729272)

This adds script/actions/retry.sh, which reruns a command with exponential backoff (4 attempts, waiting 1s, 4s and 16s; tunable through RETRY_ATTEMPTS, RETRY_DELAY and RETRY_FACTOR), and prefixes those commands with it. It's a script rather than a composite action so each step stays a plain run: and no command has to pass through an action input. Each wrapped command is safe to repeat: a failed git clone removes its partial directory, and a failed git fetch leaves the repository as it was. A retry shows up as a warning annotation; after the last attempt the step fails with the command's own exit code, as it does today.

The depot_tools clone inside build-tools itself gets the same treatment in electron/build-tools#895, which CI picks up on its next release because this action installs the latest build-tools.

Checklist

• I have built and tested this change
• I have filled out the PR description
• I have reviewed and verified the changes

Release Notes

Notes: none