Use ccache for faster compilation speed

.github/workflows/build.yml

@@ -13,10 +13,9 @@ jobs:
     - name: Checkout Sources
       uses: actions/checkout@v2
       with:
-          clean: false # Re-use artifacts from previous build
           submodules: recursive
     - name: Build Kernel
-      run: make
+      run: PATH="/usr/lib/ccache:${PATH}" make
     - name: Read Build Information
       id: read_build_info
       run: |
@@ -28,7 +27,7 @@ jobs:
     - name: Upload Artifacts
       uses: actions/upload-artifact@v2-preview
       with:
-        name: debs
+        nme: debs
         path: "*.deb"
     - name: Create Release
       if: startsWith(github.ref, 'refs/tags/release')
@@ -38,7 +37,7 @@ jobs:
         set -x
         assets=()
         for asset in ./*.deb; do
-          assets + =("-a" "$asset")
+          assets += ("-a" "$asset")
         done
         tag_name=${GITHUB_REF#"refs/tags/"}
         release_name="${{ steps.read_build_info.outputs.release }}"