TEST ONLY: point kernel-container-build at extract-kernel-tarball

DO NOT MERGE — revert before opening for review.

This commit points the workflow at the kernel-container-build feature
branch so workflow_dispatch can exercise the new tarball extraction
step end-to-end before kernel-container-build#32 lands on main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 2 people

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

@@ -284,7 +284,7 @@ jobs:
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       with:
         repository: ctrliq/kernel-container-build
-        ref: main
+        ref: extract-kernel-tarball
         path: kernel-container-build
         token: ${{ steps.generate_token.outputs.token }}
 
@@ -413,7 +413,7 @@ jobs:
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       with:
         repository: ctrliq/kernel-container-build
-        ref: main
+        ref: extract-kernel-tarball
         path: kernel-container-build
         token: ${{ steps.generate_token.outputs.token }}
 
@@ -495,7 +495,7 @@ jobs:
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       with:
         repository: ctrliq/kernel-container-build
-        ref: main
+        ref: extract-kernel-tarball
         path: kernel-container-build
         token: ${{ steps.generate_token.outputs.token }}
 
@@ -565,7 +565,7 @@ jobs:
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       with:
         repository: ctrliq/kernel-container-build
-        ref: main
+        ref: extract-kernel-tarball
         path: kernel-container-build
         token: ${{ steps.generate_token.outputs.token }}
 
@@ -663,7 +663,7 @@ jobs:
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       with:
         repository: ctrliq/kernel-container-build
-        ref: main
+        ref: extract-kernel-tarball
         path: kernel-container-build
         token: ${{ steps.generate_token.outputs.token }}