Add GitHub workflow for building kpatch shellcode

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+name: Build kpatch
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: src/kpatch
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install build tools
+        run: sudo apt-get update && sudo apt-get install -y build-essential
+
+      - name: Build kpatch binaries
+        run: make
+
+      - name: Upload entire repository as zip
+        uses: actions/upload-artifact@v4
+        with:
+          name: psfree-lapse-archive
+          path: ${{ github.workspace }}
+          if-no-files-found: error
+          compression-level: 9