Updating backport workflow to include custom branch name

[VachaShah]

Signed-off-by: Vacha Shah [email protected]

Description

Updating the backport workflow to resolve permissions issue opensearch-project/OpenSearch#1712 and allow custom branch naming for backport branches to manage branch permissions.

Issues Resolved

[List any issues this PR will resolve]

Check List

• 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.
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[codecov-commenter]

Codecov Report

Merging #173 (d5746c5) into main (fdda823) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #173   +/-   ##
=======================================
  Coverage   43.87%   43.87%           
=======================================
  Files         156      156           
  Lines        5181     5181           
  Branches      966      953   -13     
=======================================
  Hits         2273     2273           
  Misses       2690     2690           
  Partials      218      218           

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[amitgalitz]

LGTM! Thanks for making the change!

[opensearch-trigger-bot]

The backport to 1.x 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-1.x 1.x
# Navigate to the new working tree
cd .worktrees/backport-1.x
# Create a new branch
git switch --create backport/backport-173-to-1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 ad6aa5ba2c8279235a51d6db349dfa131a30575e
# Push it to GitHub
git push --set-upstream origin backport/backport-173-to-1.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.x

Then, create a pull request where the base branch is 1.x and the compare/head branch is backport/backport-173-to-1.x.