CI: Add workflow file.

.github/workflows/cmake-multi-platform.yml

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+# This starter workflow is for a CMake project running on multiple platforms. There is a different starter workflow if you just want a single platform.
+# See: https://github.com/actions/starter-workflows/blob/main/ci/cmake-single-platform.yml
+name: Build patcher for multi platforms.
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      # Set fail-fast to false to ensure that feedback is delivered for all matrix combinations. Consider changing this to true when your workflow is stable.
+      fail-fast: false
+
+      # Set up a matrix to run the following 3 configurations:
+      # 1. <Windows, Release, latest MSVC compiler toolchain on the default runner image, default generator>
+      # 2. <Linux, Release, latest Clang compiler toolchain on the default runner image, default generator>
+      #
+      # To add more build types (Release, Debug, RelWithDebInfo, etc.) customize the build_type list.
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        arch: [x64, arm64]
+        build_type: [Release]
+        c_compiler: [clang, cl]
+        include:
+          - os: windows-latest
+            c_compiler: cl
+            cpp_compiler: cl
+          - os: ubuntu-latest
+            c_compiler: clang
+        exclude:
+          - os: windows-latest
+            c_compiler: clang
+          - os: ubuntu-latest
+            c_compiler: cl
+          - os: macos-latest
+            c_compiler: cl
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set reusable strings
+        id: strings
+        shell: bash
+        run: |
+          echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
+          echo  >> $GITHUB_ENV
+
+      - name: Configure CMake
+        run: >
+          cmake -B ${{ steps.strings.outputs.build-output-dir }}
+          -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }}
+          -DCMAKE_C_COMPILER=${{ matrix.c_compiler }}
+          -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
+          -S ${{ github.workspace }}
+
+      - name: Build Patcher.
+        run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} --target DualBootKernelPatcher
+
+      - name: Upload Windows x64 Artifact
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch == 'x64' && matrix.os == 'windows-latest' }}
+        with:
+          name: DualBootKernelPatcher-Windows-x64
+          path: ${{ steps.strings.outputs.build-output-dir }}/DualBootKernelPatcher*
+
+      - name: Upload Linux x64 Artifact
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch == 'x64' && matrix.os == 'ubuntu-latest' }}
+        with:
+          name: DualBootKernelPatcher-Linux-x64
+          path: ${{ steps.strings.outputs.build-output-dir }}/DualBootKernelPatcher*
+
+      - name: Upload MacOS x64 Artifact
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch == 'x64' && matrix.os == 'macos-latest' }}
+        with:
+          name: DualBootKernelPatcher-MacOS-x64
+          path: ${{ steps.strings.outputs.build-output-dir }}/DualBootKernelPatcher*
+
+      - name: Upload Windows arm64 Artifact
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch == 'arm64' && matrix.os == 'windows-latest' }}
+        with:
+          name: DualBootKernelPatcher-Windows-arm64
+          path: ${{ steps.strings.outputs.build-output-dir }}/DualBootKernelPatcher*
+
+      - name: Upload Linux arm64 Artifact
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch == 'arm64' && matrix.os == 'ubuntu-latest' }}
+        with:
+          name: DualBootKernelPatcher-Linux-arm64
+          path: ${{ steps.strings.outputs.build-output-dir }}/DualBootKernelPatcher*
+
+      - name: Upload MacOS arm64 Artifact
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch == 'arm64' && matrix.os == 'macos-latest' }}
+        with:
+          name: DualBootKernelPatcher-MacOS-arm64
+          path: ${{ steps.strings.outputs.build-output-dir }}/DualBootKernelPatcher*
+
+      - name: Build shellcodes.
+        if: ${{ matrix.arch == 'arm64' && matrix.os == 'ubuntu-latest' }}
+        run: |
+          sudo apt install binutils-aarch64-linux-gnu
+          cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} --target all
+
+      - name: Upload ShellCode Artifact
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch == 'arm64' && matrix.os == 'ubuntu-latest' }}
+        with:
+          name: Shellcodes
+          path: ${{ steps.strings.outputs.build-output-dir }}/ShellCode/*.bin