added docker build workflow for ci of the build process

Author: Sascha Jongebloed

.github/workflows/docker-build.yml

@@ -0,0 +1,18 @@
+name: Test Docker Build
+
+on:
+  push:
+    branches: [ dev ]
+  pull_request:
+    branches: [ dev ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Build Docker image
+        run: |
+          docker build -t knowrob_designator .