Enable running host tests in Github Actions

.github/workflows/host_tests.yml

@@ -0,0 +1,20 @@
+name: Run host tests with CMake
+
+on: [pull_request]
+
+jobs:
+  host-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install dev tools
+        run: sudo apt-get install -y cmake ninja-build
+
+      - name: Compile and test for host
+        run: |
+            mkdir __build && cd __build
+            cmake .. -GNinja -DBUILD_GREENTEA_TESTS=FALSE -DBUILD_TESTING=TRUE
+            ninja
+            ctest . --output-on-failure -V