Update github action gradle-check to use pull_request_target for accessing token

[peterzhuamazon]

Signed-off-by: Peter Zhu zhujiaxi@amazon.com

Description

Update github action gradle-check to use pull_request_target for accessing token
Since Jenkins workflow needs to be triggered through github workflow with a token, pull_request does not allow fork repo to read secret just to be safe, therefore change to use pull_request_target for this access.

https://securitylab.github.com/research/github-actions-preventing-pwn-requests/

Workflows triggered via pull_request_target have write permission to the target repository. They also have access to target repository secrets. The same is true for workflows triggered on pull_request from a branch in the same repository, but not from external forks. The reasoning behind the latter is that it is safe to share the repository secrets if the user creating the PR has write permission to the target repository already.

Issues Resolved

opensearch-project/opensearch-build#851

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[peterzhuamazon]

@CEHENKLE note that pull_request_target will not trigger in the 1st PR unless it is already merged.

This is my test run on this: #3727

Thanks.

[opensearch-trigger-bot]

The backport to 2.0 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.0 2.0
# Navigate to the new working tree
cd .worktrees/backport-2.0
# Create a new branch
git switch --create backport/backport-3728-to-2.0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 4f7bf08c1eaf0a4a37597920119616e862b5f6ed
# Push it to GitHub
git push --set-upstream origin backport/backport-3728-to-2.0
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.0

Then, create a pull request where the base branch is 2.0 and the compare/head branch is backport/backport-3728-to-2.0.