[CI] GitHub action first test

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

.github/workflows/CI-build.yml

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+name: CI Build
+on: [push, pull_request]
+jobs:
+  # This is the name of the job - can be whatever.
+  build:
+
+    # Here we tell GitHub that the jobs must be determined
+    # dynamically depending on a matrix configuration.
+    strategy:
+      matrix:
+        fqbn: [
+          "STM32:stm32:Disco:pnum=DISCO_L475VG_IOT"
+        ]
+
+    runs-on: ubuntu-latest
+
+    # This is the list of steps this job will run.
+    steps:
+      # First of all, we clone the repo using the checkout action.
+      - name: Checkout
+        uses: actions/checkout@master
+
+      # We use the arduino/setup-arduino-cli action to install and
+      # configure the Arduino CLI on the system.
+      - name: Setup Arduino CLI
+        uses: arduino/setup-arduino-cli@v1.0.0
+
+      # We then install the platform
+      - name: Install platform
+        env:
+          STM32_JSON: https://github.com/stm32duino/BoardManagerFiles/raw/master/STM32/package_stm_index.json
+        run: |
+          arduino-cli core update-index --additional-urls $STM32_JSON
+          arduino-cli core install STM32:stm32 --additional-urls $STM32_JSON
+
+      # Finally, we compile the sketch, using the FQBN that was set
+      # in the build matrix.
+      - name: Compile Sketch
+        run: arduino-cli compile --fqbn ${{ matrix.fqbn }} ./CI/build/examples/BareMinimum

CI/build/examples/BareMinimum/BareMinimum.ino

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+void setup() {
+  // put your setup code here, to run once:
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}

CI/build/examples/BareMinimum/BareMinimum.txt

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+The bare minimum of code needed to start an Arduino sketch.