Github actions support .net CI builds

.github/workflows/ci_build.yml

@@ -0,0 +1,14 @@
+#### Build and tests all pushes, also code coverage
+name: CI build
+on: [push, pull_request]
+jobs:
+    build:
+        name: Build sources
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@master
+            - uses: actions/setup-dotnet@v1
+            - name: Build code
+              run: dotnet build
+            - name: Test code
+              run: dotnet test

.github/workflows/push_docker.yml

@@ -4,7 +4,6 @@ on:
    push:
      branches:
       - master
-      - order
 
 jobs:
   deploy: