[nrf noup] ci: Dynamically set target branch for manifest PRs

Dynamically set target branch for manifest PRs

Signed-off-by: Jan Gałda <[email protected]>

Author: jangalda-nsc

.github/workflows/manifest-PR.yml

@@ -4,16 +4,35 @@ on:
     types: [opened, synchronize, closed, reopened]
     branches:
       - main
+      - ncs-v*-branch
 
 permissions:
   contents: read
 
 jobs:
   call-manifest-pr-action:
     runs-on: ubuntu-latest
+    outputs:
+      base-branch: ${{ steps.set-base-branch.outputs.base_branch }}
     steps:
+#      Determine the base branch:
+#        * sdk-zephyr/main -> sdk-nrf/main
+#        * sdk-zephyr/ncs-vX.Y-branch -> sdk-nrf/vX.Y-branch
+      - name: Set base branch
+        id: set-base-branch
+        run: |
+          if [[ "${{ github.event.pull_request.base.ref }}" == "main" ]]; then
+            echo "base_branch=main" >> "$GITHUB_OUTPUT"
+          elif [[ "${{ github.event.pull_request.base.ref }}" =~ ^ncs-(v[0-9]+\.[0-9]+-branch)$ ]]; then
+            branch_name="${{ github.event.pull_request.base.ref }}"
+            branch_name="${branch_name#ncs-}"
+            echo "base_branch=${branch_name}" >> "$GITHUB_OUTPUT"
+          else
+            echo "Error: Unsupported base branch: ${{ github.event.pull_request.base.ref }}" >&2
+            exit 1
       - name: handle manifest PR
         uses: nrfconnect/action-manifest-pr@main
         with:
           token: ${{ secrets.NCS_GITHUB_TOKEN }}
           manifest-pr-title-details: ${{ github.event.pull_request.title }}
+          base-branch: ${{ steps.set-base-branch.outputs.base_branch }}