add .worktrees/ to .gitignore

[rursprung]

the .worktrees/ folder is used in the guide for manual backporting as the location where to create the worktree for the backport branch.

as this is inside of the repository the folder will be reported as an untracked file. to avoid this, i've now added it to .gitignore.

though it might be better to create the worktree outside of the repository, the documentation on it doesn't comment explicitly on using it inside of the main worktree, however none of the examples do that.

Signed-off-by: Ralph Ursprung [email protected]

Description

see commit message. feel free to use this PR to instead discuss whether the worktrees shouldn't be managed outside of the repo instead (= changing the message for manual backports and maybe also the scripts for the automated backports if they also use this path).

Issues Resolved

n/a

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
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

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.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/5347/
• CommitID: a800f6b

[rursprung]

Gradle Check (Jenkins) Run Completed with:

* **RESULT:** UNSTABLE ❌

* **URL:** https://build.ci.opensearch.org/job/gradle-check/5347/

* **CommitID:** [a800f6b](https://github.com/opensearch-project/OpenSearch/commit/a800f6b725075c9c808a5f9672348b1d0d9e08cd)

and another false reject... 😞

[andrross]

Maybe we should just change the instructions here? Seems like using worktrees outside the repository is the more normal practice.

[andrross]

PR to change the backport instructions here: VachaShah/backport#5

[rursprung]

superseded by the changes done to the backport suggestions => no longer needed