github: add pkgcheck ci (copied from kodi-overlay)

.github/workflows/pkgcheck.yaml

@@ -0,0 +1,15 @@
+name: pkgcheck
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Run pkgcheck
+        uses: pkgcore/pkgcheck-action@v1