create-azure-self-hosted-runners: output customScriptInstanceView

We want to see the output of the CustomScriptExtension in the pipeline,
as it contains helpful info on things like the GfW and GitHub Actions
runner versions that got installed.

Signed-off-by: Dennis Ameling <[email protected]>

Author: dennisameling

.github/workflows/create-azure-self-hosted-runners.yml

@@ -149,10 +149,16 @@ jobs:
         creds: ${{ secrets.AZURE_CREDENTIALS }}
 
     - uses: azure/arm-deploy@v1
+      id: deploy-arm-template
       with:
         resourceGroupName: ${{ secrets.AZURE_RESOURCE_GROUP }}
         template: ./azure-self-hosted-runners/azure-arm-template.json
         parameters: ./azure-self-hosted-runners/azure-arm-template-example-parameters.json ${{ env.AZURE_ARM_PARAMETERS }}
+    
+    - name: Show post-deployment script output
+      env:
+        CUSTOM_SCRIPT_OUTPUT: ${{ steps.deploy-arm-template.outputs.customScriptInstanceView }}
+      run: echo "$CUSTOM_SCRIPT_OUTPUT" | jq -r '.substatuses[0].message' 
 
     - name: Deallocate the VM for later use
       if: env.DEALLOCATE_IMMEDIATELY == 'true'