Enforce docspath (#31)

* Try to ensure DocsPath is defined somehow

If it's not defined, it will have a value of `$(DocsPath)` passed in from the pipeline yaml, so this should hopefully catch that

Author: FISHMANPET

mkdocs/umn-mkdocs.yml

@@ -21,6 +21,11 @@ parameters:
 jobs:
 - job: build
   steps:
+  - bash: |
+      echo '$(Build.DefinitionName)'
+      echo '${{ parameters.DocsPath }}'
+      if [[ '${{ parameters.DocsPath }}' == *"DocsPath"* ]]; then exit 1; fi;
+    displayName: Fail build if DocsPath is not set
   # - script: |
   #     sudo npm i -g markdownlint-cli
   #     markdownlint "**/*.md"