Disable Dockerfile detection. (#1407)

azure-pipelines.yml

@@ -11,6 +11,8 @@ variables:
     value: true
   - name: _BuildConfig
     value: Release
+  - name: DisableDockerDetector
+    value: true
 
     # used for post-build phases, internal builds only
   - ${{ if and(ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}: