CU-8699wjhfu: add build dep

Author: Tom Searle

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install requests pytest
+          pip install requests pytest build
 
       - name: Install client package in development mode
         run: |