add build cache

Author: vankoven

.github/workflows/package.yml

@@ -42,6 +42,15 @@ jobs:
   build_libbpf:
     runs-on: ubuntu-22.04
     steps:
+
+      - name: Restore cached libbpf
+        id: cache-libbpf
+        uses: actions/cache/restore@v4
+        with:
+          path: |
+            libbpf*.deb
+          key: ${{ runner.os }}-libbpf
+
       - name: install dependencies
         run: |
           sudo apt update
@@ -52,10 +61,19 @@ jobs:
           git clone https://github.com/sudipm-mukherjee/libbpf
           cd libbpf
           dpkg-buildpackage -uc -us -b
-    
-      - run: |
+
+      - name: list build artifacts
+        run: |
           ls -lah
 
+      - name: save libbpf
+        id: cache-libbpf-save
+        uses: actions/cache/save@v4
+        with:
+          path: |
+            libbpf*.deb
+          key: ${{ steps.cache-libbpf.outputs.cache-primary-key }}
+
       - name: upload package artifacts
         uses: actions/upload-artifact@v4
         with: