[CI] Add Continuous Integration workflow

 * astyle-check
 * compile-examples

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

Author: fpistm

.github/workflows/Continuous-Integration.yml

@@ -0,0 +1,39 @@
+name: STM32 Core Continuous Integration
+on: [push, pull_request]
+jobs:
+  astyle_check:
+    runs-on: ubuntu-latest
+    name: AStyle check
+    steps:
+    # First of all, clone the repo using the checkout action.
+    - name: Checkout
+      uses: actions/checkout@master
+
+    - name: Astyle check
+      id: Astyle
+      uses: stm32duino/actions/astyle-check@master
+
+    # Use the output from the `Astyle` step
+    - name: Astyle Errors
+      if: failure()
+      run: |
+        cat ${{ steps.Astyle.outputs.astyle-result }}
+        exit 1
+  core_build:
+    runs-on: ubuntu-latest
+    name: Core compilation
+    steps:
+    # First of all, clone the repo using the checkout action.
+    - name: Checkout
+      uses: actions/checkout@master
+
+    - name: Compilation
+      id: Compile
+      uses: stm32duino/actions/compile-examples@master
+
+    # Use the output from the `Compile` step
+    - name: Compilation Errors
+      if: failure()
+      run: |
+        cat ${{ steps.Compile.outputs.compile-result }}
+        exit 1