github: enable debian-11-arm64 runner

.github/workflows/c-cpp.yml

@@ -1,11 +1,11 @@
 name: Build & Deploy Engine
 on: [push, pull_request]
 jobs:
-#  cleanup:
-#    runs-on: self-hosted
-#    steps:
-#    - name: Cleanup
-#      run: rm -rf .* || true
+  cleanup:
+    runs-on: self-hosted
+    steps:
+    - name: Cleanup
+      run: rm -rf .* || true
   build:
     runs-on: ${{ matrix.os }}
     continue-on-error: true
@@ -21,9 +21,9 @@ jobs:
           - os: ubuntu-20.04
             targetos: linux
             targetarch: i386
-#          - os: ubuntu-aarch64-20.04
-#            targetos: linux
-#            targetarch: aarch64
+          - os: debian-11-arm64
+            targetos: linux
+            targetarch: aarch64
           - os: ubuntu-20.04
             targetos: android
             targetarch: multiarch