Add build workflow (fix issue space-ros#35)

.github/workflows/docker-image.yml

@@ -0,0 +1,26 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Run the build.sh scripts
+      run: |
+            # find the build.sh scripts and execute them
+            echo "Running all build.sh scripts in repo"
+            for f in $(find . -iname 'build.sh')
+            do 
+              $f || exit 1
+            done
+            echo "Done running build.sh scripts"