feat(ci): add GitHub Action for backporting merged PRs

[wdconinc]

Briefly, what does this PR introduce? Please link to any relevant presentations or discussions.

This PR adds a PR backporting action by tag, similar to EICrecon.

What is the urgency of this PR?

• High (please describe reason below)
• Medium
• Low

What kind of change does this PR introduce?

• Bug fix (issue #__)
• New feature (issue: PR backport action)
• Optimization (issue #__)
• Updated documentation
• other: __

Please check if any of the following apply

• This PR introduces breaking changes. Please describe changes users need to make below.
• This PR changes default behavior. Please describe changes below.
• AI was used in preparing this PR. Please describe usage below.

[Copilot]

Pull request overview

Adds a GitHub Actions workflow to automatically create backport pull requests for merged PRs, enabling label/tag-driven backporting similar to other EIC org repos.

Changes:

• Introduces a new pull_request_target workflow that triggers on merged PR close events.
• Runs korthout/backport-action to open backport PRs using a provided token.

[github-actions]

Capybara summary for PR 352

• rec_dis_10x100_minQ2=1000_epic_craterlake_amd64 (new artifact) (ref artifact)
• rec_dis_10x100_minQ2=1_epic_craterlake_amd64 (new artifact) (ref artifact)
• rec_dis_18x275_minQ2=1000_epic_craterlake_amd64 (new artifact) (ref artifact)
• rec_dis_18x275_minQ2=1_epic_craterlake_amd64 (new artifact) (ref artifact)
• rec_dis_5x41_minQ2=1_epic_craterlake_amd64 (new artifact) (ref artifact)
• rec_dis_5x41_minQ2=1_epic_craterlake_amd64_vs_arm64
• rec_dis_5x41_minQ2=1_epic_craterlake_arm64 (new artifact) (ref artifact)
• rec_e_1GeV_20GeV_epic_craterlake_amd64 (new artifact) (ref artifact)
• rec_e_1GeV_20GeV_epic_craterlake_amd64_vs_arm64
• rec_e_1GeV_20GeV_epic_craterlake_arm64 (new artifact) (ref artifact)
• rec_pi_1GeV_20GeV_epic_craterlake_amd64 (new artifact) (ref artifact)
• rec_pi_1GeV_20GeV_epic_craterlake_amd64_vs_arm64
• rec_pi_1GeV_20GeV_epic_craterlake_arm64 (new artifact) (ref artifact)
• sim_dis_10x100_minQ2=1000_epic_craterlake_amd64 (new artifact) (ref artifact)
• sim_dis_10x100_minQ2=1_epic_craterlake_amd64 (new artifact) (ref artifact)
• sim_dis_18x275_minQ2=1000_epic_craterlake_amd64 (new artifact) (ref artifact)
• sim_dis_18x275_minQ2=1_epic_craterlake_amd64 (new artifact) (ref artifact)
• sim_dis_5x41_minQ2=1_epic_craterlake_amd64 (new artifact) (ref artifact)
• sim_dis_5x41_minQ2=1_epic_craterlake_amd64_vs_arm64
• sim_dis_5x41_minQ2=1_epic_craterlake_arm64 (new artifact) (ref artifact)
• sim_e_1GeV_20GeV_epic_craterlake_amd64 (new artifact) (ref artifact)
• sim_e_1GeV_20GeV_epic_craterlake_amd64_vs_arm64
• sim_e_1GeV_20GeV_epic_craterlake_arm64 (new artifact) (ref artifact)
• sim_pi_1GeV_20GeV_epic_craterlake_amd64 (new artifact) (ref artifact)
• sim_pi_1GeV_20GeV_epic_craterlake_amd64_vs_arm64
• sim_pi_1GeV_20GeV_epic_craterlake_arm64 (new artifact) (ref artifact)
  ^{_{Last updated 2026-07-15T09:14-04:00 332a06f}}

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.