Add GitHub Docker action for testing UDP and HTTP file transfers

The Dockerfile works when run locally. The GitHub action
plumbing may or not work in this state.

.github/workflows/test-transfer-udp-http.yml

@@ -0,0 +1,18 @@
+name: "Test UDP and HTTP file transfer"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]]
+
+jobs:
+  test-transfer-http:
+    runs-on: ubuntu-latest
+    name: Test BitTorrent file transfer over UDP and HTTP
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Test file transferS
+        uses: ../actions/test-transfer-udp-http/action@v1
+        id: test_transfer_udp_http