ci: simplify workflow by removing toolchain setup and matrix strategy

Remove unnecessary toolchain download and environment setup steps from build.yml
Simplify workflow by directly using input variables instead of matrix strategy in main.yml

.github/workflows/build.yml

@@ -78,31 +78,6 @@ jobs:
           ccache --set-config=compression=true
           echo "CCACHE_DIR=$HOME/.ccache" >> $GITHUB_ENV
 
-      - name: Download toolchain
-        run: |
-          AOSP_MIRROR=https://android.googlesource.com
-          BRANCH=main-kernel-build-2024
-          git clone $AOSP_MIRROR/kernel/prebuilts/build-tools -b $BRANCH --depth 1 kernel-build-tools
-          git clone $AOSP_MIRROR/platform/system/tools/mkbootimg -b $BRANCH --depth 1 mkbootimg
-
-      - name: Set environment variables
-        run: |
-          echo "AVBTOOL=$GITHUB_WORKSPACE/kernel-build-tools/linux-x86/bin/avbtool" >> $GITHUB_ENV
-          echo "MKBOOTIMG=$GITHUB_WORKSPACE/mkbootimg/mkbootimg.py" >> $GITHUB_ENV
-          echo "UNPACK_BOOTIMG=$GITHUB_WORKSPACE/mkbootimg/unpack_bootimg.py" >> $GITHUB_ENV
-
-      - name: Set boot sign key
-        env:
-          BOOT_SIGN_KEY: ${{ secrets.BOOT_SIGN_KEY }}
-        run: |
-          if [ ! -z "$BOOT_SIGN_KEY" ]; then
-            echo "$BOOT_SIGN_KEY" > ./kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem
-            echo "BOOT_SIGN_KEY_PATH=$GITHUB_WORKSPACE/kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem" >> $GITHUB_ENV
-          else
-            echo "BOOT_SIGN_KEY is not set. Using AOSP sign key..."
-            echo "BOOT_SIGN_KEY_PATH=$GITHUB_WORKSPACE/kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem" >> $GITHUB_ENV
-          fi
-
       - name: Install Repo
         run: |
           mkdir -p ./git-repo

.github/workflows/main.yml

@@ -46,83 +46,45 @@ on:
         type: string
         default: ""
 
-jobs:          
-  set-matrix:
-    runs-on: ubuntu-latest
-    timeout-minutes: 120
-    outputs:
-      matrix: ${{ steps.set-matrix.outputs.matrix }}
-    steps:
-      - id: set-matrix
-        run: |
-          case "${{ inputs.kernel_variant }}" in
-            "WKSU")
-              VARIANTS=("\"WILD\"")
-              ;;
-            "KSU")
-              VARIANTS=("\"KSU\"")
-              ;;
-            "NEXT")
-              VARIANTS=("\"NEXT\"")
-              ;;
-          esac
-
-          echo "matrix={\"kernelsu_variant\": [$(IFS=,; echo "${VARIANTS[*]}")]}" >> $GITHUB_OUTPUT
-
+jobs:
   build-kernels-a12:
-    needs: set-matrix
     uses: ./.github/workflows/kernel-a12.yml
     secrets: inherit
-    strategy:
-      fail-fast: true
-      matrix: ${{ fromJson(needs.set-matrix.outputs.matrix) }}
     with:
-      kernelsu_variant: ${{ matrix.kernelsu_variant }}
-      kernelsu_branch: ${{ inputs.kernelsu_branch }}
-      kernelsu_branch_other: ${{ inputs.kernelsu_branch_other }}
-      use_make: ${{ inputs.use_make }}
+      kernelsu_variant: ${{ github.event.inputs.kernel_variant == 'WKSU' && 'WILD' || github.event.inputs.kernel_variant == 'KSU' && 'KSU' || 'NEXT' }}
+      kernelsu_branch: ${{ github.event.inputs.kernelsu_branch }}
+      kernelsu_branch_other: ${{ github.event.inputs.kernelsu_branch_other }}
+      use_make: ${{ github.event.inputs.use_make }}
 
   build-kernels-a13:
-    needs: set-matrix
     uses: ./.github/workflows/kernel-a13.yml
     secrets: inherit
-    strategy:
-      fail-fast: true
-      matrix: ${{ fromJson(needs.set-matrix.outputs.matrix) }}
     with:
-      kernelsu_variant: ${{ matrix.kernelsu_variant }}
-      kernelsu_branch: ${{ inputs.kernelsu_branch }}
-      kernelsu_branch_other: ${{ inputs.kernelsu_branch_other }}
-      use_make: ${{ inputs.use_make }}
+      kernelsu_variant: ${{ github.event.inputs.kernel_variant == 'WKSU' && 'WILD' || github.event.inputs.kernel_variant == 'KSU' && 'KSU' || 'NEXT' }}
+      kernelsu_branch: ${{ github.event.inputs.kernelsu_branch }}
+      kernelsu_branch_other: ${{ github.event.inputs.kernelsu_branch_other }}
+      use_make: ${{ github.event.inputs.use_make }}
 
   build-kernels-a14:
-    needs: set-matrix
     uses: ./.github/workflows/kernel-a14.yml
     secrets: inherit
-    strategy:
-      fail-fast: true
-      matrix: ${{ fromJson(needs.set-matrix.outputs.matrix) }}
     with:
-      kernelsu_variant: ${{ matrix.kernelsu_variant }}
-      kernelsu_branch: ${{ inputs.kernelsu_branch }}
-      kernelsu_branch_other: ${{ inputs.kernelsu_branch_other }}
-      use_make: ${{ inputs.use_make }}
+      kernelsu_variant: ${{ github.event.inputs.kernel_variant == 'WKSU' && 'WILD' || github.event.inputs.kernel_variant == 'KSU' && 'KSU' || 'NEXT' }}
+      kernelsu_branch: ${{ github.event.inputs.kernelsu_branch }}
+      kernelsu_branch_other: ${{ github.event.inputs.kernelsu_branch_other }}
+      use_make: ${{ github.event.inputs.use_make }}
 
   build-kernels-a15:
-    needs: set-matrix
     uses: ./.github/workflows/kernel-a15.yml
     secrets: inherit
-    strategy:
-      fail-fast: true
-      matrix: ${{ fromJson(needs.set-matrix.outputs.matrix) }}
     with:
-      kernelsu_variant: ${{ matrix.kernelsu_variant }}
-      kernelsu_branch: ${{ inputs.kernelsu_branch }}
-      kernelsu_branch_other: ${{ inputs.kernelsu_branch_other }}
-      use_make: ${{ inputs.use_make }}
+      kernelsu_variant: ${{ github.event.inputs.kernel_variant == 'WKSU' && 'WILD' || github.event.inputs.kernel_variant == 'KSU' && 'KSU' || 'NEXT' }}
+      kernelsu_branch: ${{ github.event.inputs.kernelsu_branch }}
+      kernelsu_branch_other: ${{ github.event.inputs.kernelsu_branch_other }}
+      use_make: ${{ github.event.inputs.use_make }}
 
   release:
-    if: ${{ inputs.release_type == 'Release' || inputs.release_type == 'Pre-Release' }}
+    if: ${{ github.event.inputs.release_type == 'Release' || github.event.inputs.release_type == 'Pre-Release' }}
     runs-on: ubuntu-latest
     needs:
       - build-kernels-a12