Add Docker image build workflow for stable releases

.github/workflows/stable-image-build.yml

@@ -0,0 +1,31 @@
+name: Build Owlbot DEV Docker image
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+    environment: stable
+
+    steps:
+    -
+      name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        path: 'owlbot-repo'
+    - 
+      name: Build the Docker image
+      run: docker build . --file owlbot-repo/Dockerfile --tag cntoarma/owlbot:latest
+    -
+      name: Authenticate to CNTO DockerHub
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+    -
+      name: Publish image to DockerHub
+      run: docker image push cntoarma/owlbot:latest