Add build action

.github/workflows/build.yml

@@ -0,0 +1,26 @@
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: build project
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Run CMake+Ninja
+      uses: lukka/run-cmake@v3
+      with:
+        cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
+        buildDirectory: '${{runner.workspace}}/b/ninja'
+        cmakeAppendedArgs: '-GNinja -DENABLE_RTLSDR=OFF -DENABLE_SOAPYSDR=OFF'
+    - name: Run CMake+UnixMakefiles
+      uses: lukka/run-cmake@v3
+      with:
+        cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
+        buildDirectory: '${{runner.workspace}}/b/unixmakefiles'
+        cmakeAppendedArgs: '-G "Unix Makefiles" -DENABLE_RTLSDR=OFF -DENABLE_SOAPYSDR=OFF'
+    - name: Autotools autoreconf
+      run: autoreconf --install
+    - name: Autotools configure
+      run: ./configure
+    - name: Autotools make
+      run: make