feat: Add a GitHub workflow for building LKM locally

.github/workflows/build-lkm-local.yml

@@ -0,0 +1,74 @@
+name: Build LKM for KernelSU Local
+on:
+  workflow_call:
+    inputs:
+      upload:
+        required: true
+        type: boolean
+        default: true
+        description: "Whether to upload to branch"
+    secrets:
+      # username:github_pat
+      TOKEN:
+        required: true
+  workflow_dispatch:
+    inputs:
+      upload:
+        required: true
+        type: boolean
+        default: true
+        description: "Whether to upload to branch"
+jobs:
+  build-lkm:
+    strategy:
+      matrix:
+        include:
+          - version: "android12-5.10"
+            sub_level: 236
+            os_patch_level: 2025-05
+          - version: "android13-5.10"
+            sub_level: 234
+            os_patch_level: 2025-03
+          - version: "android13-5.15"
+            sub_level: 178
+            os_patch_level: 2025-03
+          - version: "android14-5.15"
+            sub_level: 178
+            os_patch_level: 2025-03
+          - version: "android14-6.1"
+            sub_level: 134
+            os_patch_level: 2025-05
+          - version: "android15-6.6"
+            sub_level: 87
+            os_patch_level: 2025-05
+    # uses: ./.github/workflows/gki-kernel-mock.yml when debugging
+    uses: ./.github/workflows/gki-kernel-local.yml
+    with:
+      version: ${{ matrix.version }}
+      version_name: ${{ matrix.version }}.${{ matrix.sub_level }}
+      tag: ${{ matrix.version }}-${{ matrix.os_patch_level }}
+      os_patch_level: ${{ matrix.os_patch_level }}
+      build_lkm: true
+
+  push-to-branch:
+    needs: [build-lkm]
+    runs-on: self-hosted
+    if: ${{ inputs.upload }}
+    steps:
+      - name: Download all workflow run artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: bin/
+          merge-multiple: true
+      - name: Push to branch LKM
+        run: |
+          cd bin
+          git config --global init.defaultBranch lkm
+          git init
+          git remote add origin https://${{ secrets.TOKEN }}@github.com/${{ github.repository }}
+          git config --local user.name "github-actions[bot]"
+          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          find . -type f
+          git add .
+          git commit -m "Upload LKM from ${{ github.sha }}" -m "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+          git push --force --set-upstream origin lkm