github actions: add macos action

.github/workflows/macos-build-and-test.yml

@@ -0,0 +1,22 @@
+name: MacOS Build and Test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Update brew repos
+      run: brew update
+    - name: Update packages
+      run: brew upgrade
+    - name: Tap RfidResearchGroup/proxmark3
+      run: brew tap RfidResearchGroup/proxmark3
+    - name: Install dependencies
+      run: readline qt5 RfidResearchGroup/proxmark3/arm-none-eabi-gcc
+    - name: Build
+      run: make clean && make V=1
+    - name: Test
+      run: make check