Add github actions

.github/workflows/ubuntu.yml

@@ -0,0 +1,18 @@
+name: Ubuntu-amd64
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: cmake build
+      run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+    - name: cmake make
+      run: cmake --build build --parallel 3
+    - name: test
+      run: |
+        cd build/test
+        ./popl_test

.github/workflows/windows.yml

@@ -0,0 +1,20 @@
+name: Windows-win64
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: cmake build
+      run: cmake -S . -B build
+    - name: cmake make
+      run: cmake --build build --parallel 3
+    - name: test
+      run: |
+        cd D:\a\popl\popl\build\test
+        dir
+        pwd
+        .\Debug\popl_test.exe

test/test_main.cpp

@@ -23,7 +23,7 @@ TEST_CASE("command line")
 
     try
     {
-        op.parse(args.size(), args.data());
+        op.parse(static_cast<int>(args.size()), args.data());
         REQUIRE(help_option->count() == 1);
         REQUIRE(int_option->is_set() == false);
         REQUIRE(int_option->count() == 0);