github-actions: Upload kselftests/LTP tarballs; add no_pr dispatch input

.github/workflows/kernel-build-and-test-multiarch.yml

@@ -11,6 +11,11 @@ on:
         description: "Workflow run ID to fetch artifacts from"
         required: true
         type: string
+      no_pr:
+        description: "Skip PR creation/update at the end of the run (for testing only)"
+        required: false
+        type: boolean
+        default: false
 
 permissions:
   contents: read
@@ -368,6 +373,17 @@ jobs:
           output/last_build_image.txt
         retention-days: 7
 
+    # Upload kselftests binaries tarball (the /var/kselftests install tree) for
+    # downstream testing on hosts that match the kernel release + arch.
+    - name: Upload kselftests binaries tarball
+      uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+      if: ${{ always() && needs.pre-setup.outputs.skip_kselftests == 'false' }}
+      with:
+        name: kselftests-binaries-${{ matrix.arch }}
+        path: output/kselftests-*.tar.xz
+        retention-days: 7
+        if-no-files-found: warn
+
     # Upload LTP qcow2 image
     - name: Upload LTP qcow2 image
       uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
@@ -380,6 +396,17 @@ jobs:
           output/last_build_image.txt
         retention-days: 7
 
+    # Upload LTP binaries tarball (the /opt/ltp install tree) for downstream
+    # testing on any arch-matching host.
+    - name: Upload LTP binaries tarball
+      uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+      if: ${{ always() && needs.pre-setup.outputs.skip_ltp == 'false' }}
+      with:
+        name: ltp-binaries-${{ matrix.arch }}
+        path: output/ltp-*.tar.xz
+        retention-days: 7
+        if-no-files-found: warn
+
     # Upload plain boot qcow2 image (only when both kselftests and LTP are skipped)
     - name: Upload plain boot qcow2 image
       uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
@@ -1175,10 +1202,14 @@ jobs:
     name: Create Pull Request
     runs-on: kernel-build
     needs: [pre-setup, setup, build, boot, test-kselftest, compare-kselftest, test-ltp, compare-ltp]
+    # The (workflow_dispatch || !no_pr) clause lets manual reruns opt out of
+    # PR creation by passing -f no_pr=true. workflow_run events (normal CI)
+    # are unaffected since inputs.no_pr is not set there.
     if: |
       always() &&
       needs.build.result == 'success' &&
-      needs.boot.result == 'success'
+      needs.boot.result == 'success' &&
+      (github.event_name != 'workflow_dispatch' || !inputs.no_pr)
 
     steps:
     - name: Check if branch name matches a supported pattern