[AI] Github action for unfreezing PRs

.github/workflows/merge-freeze-unfreeze.yml

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+# When the "unfreeze" label is added to a PR, add that PR to Merge Freeze's unblocked list
+# so it can be merged during a freeze. Requires MERGEFREEZE_ACCESS_TOKEN repo secret
+# (project-specific token from Merge Freeze Web API panel for actualbudget/actual / master).
+# See: https://docs.mergefreeze.com/web-api#post-freeze-status
+
+name: Merge Freeze – add PR to unblocked list
+
+on:
+  pull_request:
+    types: [labeled]
+
+jobs:
+  unfreeze:
+    if: ${{ github.event.label.name == 'unfreeze' }}
+    runs-on: ubuntu-latest
+    concurrency:
+      group: merge-freeze-unfreeze-${{ github.ref }}-labels
+      cancel-in-progress: false
+    steps:
+      - name: POST to Merge Freeze – add PR to unblocked list
+        env:
+          MERGEFREEZE_ACCESS_TOKEN: ${{ secrets.MERGEFREEZE_ACCESS_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          USER_NAME: ${{ github.actor }}
+        run: |
+          set -e
+          if [ -z "$MERGEFREEZE_ACCESS_TOKEN" ]; then
+            echo "::error::MERGEFREEZE_ACCESS_TOKEN secret is not set"
+            exit 1
+          fi
+          url="https://www.mergefreeze.com/api/branches/actualbudget/actual/master/?access_token=${MERGEFREEZE_ACCESS_TOKEN}"
+          payload=$(jq -n --arg user_name "$USER_NAME" --argjson pr "$PR_NUMBER" '{frozen: true, user_name: $user_name, unblocked_prs: [$pr]}')
+          curl -sf -X POST "$url" -H "Content-Type: application/json" -d "$payload"
+          echo "Merge Freeze updated: PR #$PR_NUMBER added to unblocked list."

upcoming-release-notes/7094.md

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+---
+category: Maintenance
+authors: [MatissJanis]
+---
+
+Add 'unfreeze' label that can be used to unfreeze PRs during mergefreeze