feat(workflows): implement download-kernel action to initialize and sync Android kernel source repository

.github/actions/download-kernel/action.yml

@@ -0,0 +1,77 @@
+name: 'Download Kernel Repository'
+description: 'Initialize and sync Android kernel source repository'
+
+inputs:
+  android_version:
+    description: 'Android version (e.g., android14)'
+    required: true
+  kernel_version:
+    description: 'Kernel version (e.g., 5.15, 6.1)'
+    required: true
+  sub_level:
+    description: 'Kernel sublevel'
+    required: true
+  os_patch_level:
+    description: 'OS patch level (e.g., 2024-01)'
+    required: true
+  kernel_root:
+    description: 'Path to kernel root directory'
+    required: true
+
+outputs:
+  kernel_root:
+    description: 'Path to the synced kernel root'
+    value: ${{ steps.setup.outputs.kernel_root }}
+  deprecated_branch:
+    description: 'Whether the branch is deprecated'
+    value: ${{ steps.sync.outputs.deprecated }}
+
+runs:
+  using: composite
+  steps:
+    - name: Setup Kernel Root Directory
+      id: setup
+      shell: bash
+      run: |
+        KERNEL_ROOT="${{ inputs.kernel_root }}"
+        mkdir -p "$KERNEL_ROOT"
+        echo "kernel_root=$KERNEL_ROOT" >> $GITHUB_OUTPUT
+        echo "✓ Created kernel root directory: $KERNEL_ROOT"
+
+    - name: Initialize and Sync Kernel Repository
+      id: sync
+      shell: bash
+      working-directory: ${{ inputs.kernel_root }}
+      run: |
+        FORMATTED_BRANCH="${{ inputs.android_version }}-${{ inputs.kernel_version }}-${{ inputs.os_patch_level }}"
+        
+        echo "========================================"
+        echo "  Initializing Kernel Repository"
+        echo "========================================"
+        echo "Branch: common-${FORMATTED_BRANCH}"
+        echo "========================================"
+        
+        repo init -u https://android.googlesource.com/kernel/manifest -b common-${FORMATTED_BRANCH} --depth=1
+
+        # Check if branch is deprecated
+        REMOTE_BRANCH=$(git ls-remote https://android.googlesource.com/kernel/common ${FORMATTED_BRANCH})
+        DEFAULT_MANIFEST_PATH=.repo/manifests/default.xml
+        DEPRECATED=false
+        
+        if grep -q deprecated <<< $REMOTE_BRANCH; then
+          sed -i "s/\"${FORMATTED_BRANCH}\"/\"deprecated\/${FORMATTED_BRANCH}\"/g" $DEFAULT_MANIFEST_PATH
+          echo "⚠ Note: Branch ${FORMATTED_BRANCH} is considered deprecated."
+          DEPRECATED=true
+        fi
+        
+        echo "deprecated=$DEPRECATED" >> $GITHUB_OUTPUT
+        
+        echo "========================================"
+        echo "  Syncing Kernel Source"
+        echo "========================================"
+        
+        repo --trace sync -c -j$(nproc --all) --fail-fast --no-tags --force-sync --no-clone-bundle
+        
+        echo "========================================"
+        echo "  ✓ Kernel Source Synced Successfully"
+        echo "========================================"

.github/workflows/build.yml

@@ -120,24 +120,14 @@ jobs:
         echo "Git Repo Tool   : ✓ $(ls git-repo/repo 2>/dev/null && echo 'Ready' || echo 'Missing')"
         echo "========================================"
 
-    - name: Initialize and Sync Kernel Source
-      working-directory: ${{ env.KERNEL_ROOT }}
-      run: |
-        FORMATTED_BRANCH="${{ inputs.android_version }}-${{ inputs.kernel_version }}-${{ inputs.os_patch_level }}"
-
-        repo init -u https://android.googlesource.com/kernel/manifest -b common-${FORMATTED_BRANCH} --depth=1
-
-        #--repo-rev=v2.16
-
-        REMOTE_BRANCH=$(git ls-remote https://android.googlesource.com/kernel/common ${FORMATTED_BRANCH})
-        DEFAULT_MANIFEST_PATH=.repo/manifests/default.xml
-        if grep -q deprecated <<< $REMOTE_BRANCH; then
-          sed -i "s/\"${FORMATTED_BRANCH}\"/\"deprecated\/${FORMATTED_BRANCH}\"/g" $DEFAULT_MANIFEST_PATH
-          echo "Note: Branch ${FORMATTED_BRANCH} is considered deprecated."
-          echo "$DEPRECATED_BRANCH=true" >> $GITHUB_ENV
-        fi
-
-        repo --trace sync -c -j$(nproc --all) --fail-fast --no-tags --force-sync --no-clone-bundle
+    - name: Download Kernel Repository
+      uses: ./.github/actions/download-kernel
+      with:
+        android_version: ${{ inputs.android_version }}
+        kernel_version: ${{ inputs.kernel_version }}
+        sub_level: ${{ inputs.sub_level }}
+        os_patch_level: ${{ inputs.os_patch_level }}
+        kernel_root: ${{ env.KERNEL_ROOT }}
 
     - name: Extract Sublevel and Set File Name
       run: |