chore: add conda env caching (#2207)

templates/conda.yml

@@ -2,19 +2,21 @@ steps:
   - bash: echo "##vso[task.prependpath]$CONDA/bin"
     displayName: Add conda to PATH
     retryCountOnTaskFailure: 1
-  #  - bash: sudo chown -R $(whoami):$(id -ng) $(CONDA_CACHE_DIR)
-#    displayName: Fix directory permissions
-#  - task: Cache@2
-#    displayName: Use cached Anaconda environment
-#    inputs:
-#      key: 'conda | "$(Agent.OS)" | environment.yml'
-#      restoreKeys: |
-#        python | "$(Agent.OS)"
-#        python
-#      path: $(CONDA_CACHE_DIR)
-#      cacheHitVar: CONDA_CACHE_RESTORED
+  - bash: sudo chown -R $(whoami):$(id -ng) $(CONDA_CACHE_DIR)
+    displayName: Fix directory permissions
+  - task: Cache@2
+    displayName: Use cached Anaconda environment
+    inputs:
+      key: 'conda | "$(Agent.OS)" | environment.yml'
+      restoreKeys: |
+        python | "$(Agent.OS)"
+        python
+      path: $(CONDA_CACHE_DIR)
+      cacheHitVar: CONDA_CACHE_RESTORED
+    timeoutInMinutes: 20
+    retryCountOnTaskFailure: 1
   - bash: |
       (timeout 30m conda env create --force -f environment.yml -v)  || (timeout 30m conda env create --force -f environment.yml -v)
     displayName: Create Anaconda environment
     retryCountOnTaskFailure: 1
-#    condition: eq(variables.CONDA_CACHE_RESTORED, 'false')
+    condition: eq(variables.CONDA_CACHE_RESTORED, 'false')