Add GitHub action with integration tests on every push

.github/workflows/main.yml

@@ -0,0 +1,32 @@
+on:
+- push
+- pull_request
+
+jobs:
+  build:
+    name: ${{ matrix.arduino-boards-fqbn }} - test compiling examples
+
+    runs-on: ubuntu-latest # I picked Ubuntu to use shell scripts.
+
+    strategy:
+      matrix:
+        # The matrix will produce one job for each configuration parameter of type `arduino-boards-fqbn`
+        # In the Arduino IDE, the fqbn is printed in the first line of the verbose output for compilation as parameter -fqbn=... for the "arduino-builder -dump-prefs" command
+        # You may add a suffix behind the fqbn with "|" to specify one board for e.g. different compile options like arduino:avr:uno|trace
+        #############################################################################################################
+        arduino-boards-fqbn:
+          - arduino:avr:uno
+          - arduino:avr:mega
+
+      # Do not cancel all jobs / architectures if one job fails
+      fail-fast: false
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Compile all examples
+        uses: ArminJo/arduino-test-compile@v3
+        with:
+          required-libraries: AccelStepper,Servo,DFRobotDFPlayerMini,U8g2,EncButton,NmraDcc,MobaTools
+          arduino-board-fqbn: ${{ matrix.arduino-boards-fqbn }}