#1962: add gate installation for docs build pipeline

.azure/azure-build-deploy-docs-pipeline.yml

@@ -27,7 +27,18 @@ jobs:
 
   - script: |
       pip install -e .[dev]
-    displayName: 'Install Yawning-Titan for docs autosummary'
+    displayName: 'Install PrimAITE for docs autosummary'
+
+  - script: |
+      GATE_WHEEL=$(ls ./GATE/arcd_gate*.whl)
+      python -m pip install $GATE_WHEEL[dev]
+    displayName: 'Install GATE'
+    condition: or(eq( variables['Agent.OS'], 'Linux' ), eq( variables['Agent.OS'], 'Darwin' ))
+
+  - script: |
+      forfiles /p GATE\ /m *.whl /c "cmd /c python -m pip install @file[dev]"
+    displayName: 'Install GATE'
+    condition: eq( variables['Agent.OS'], 'Windows_NT' )
 
   - script: |
       primaite setup