github: add build dkms package

.github/workflows/package.yml

@@ -0,0 +1,26 @@
+name: Build package
+
+on: [push, workflow_dispatch]
+
+jobs:
+  build_dkms:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: prepare sources
+        run: |
+          rm -rf debian
+          cp -r debian.dkms debian
+
+      - name: make dkms source package
+        run: |
+          fakeroot debian/rules binary
+          mv ../linux-rex-dkms*_all.deb .
+
+      - name: upload package artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: package
+          path: linux-rex-dkms*_all.deb
+          if-no-files-found: error