Implement CI tests on ArchLinux via docker container.

.github/workflows/ci-docker.yml

@@ -0,0 +1,15 @@
+name: ci-tests-docker
+on: [push]
+jobs:
+  ci_tests_archlinux:
+    runs-on: ubuntu-latest
+    name: Test Docker Action
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Test Action
+      uses: ./util/ci/actions/archlinux-test
+    - uses: actions/upload-artifact@v2
+      with:
+        name: TestLog
+        path: ${{ github.workspace }}/LastTest.log