GH-14: Add github action support

Note this is currently active in forked repos

Bug-SiliconLabs: UIC-3082
Bug-GitHub: rzr#3
Forwarded: #14
Signed-off-by: Philippe Coval <philippe.coval@silabs.com>

.github/workflows/build.yml

@@ -0,0 +1,17 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4.1.1
+      with:
+        fetch-depth: 0
+    - name: Build Docker image from sources
+      run: docker build .