Canary pipeline fixes (microsoft#224)

* Add vars template to canary pipeline

* Enable ACR authentication on AKS using a service principal
- Upgrade helm version to 3.1.1
- Remove ACR secret from the abtest-model deployment

Author: tcare

.pipelines/abtest.yml

@@ -18,9 +18,10 @@ trigger:
     - ml_service/util/smoke_test_scoring_service.py
 
 variables:
+- template: diabetes_regression-variables-template.yml
 - group: 'devopsforai-aml-vg'
 - name: 'helmVersion'
-  value: 'v3.0.1'
+  value: 'v3.1.1'
 - name: 'helmDownloadURL'
   value: 'https://get.helm.sh/helm-$HELM_VERSION-linux-amd64.tar.gz'
 - name: 'blueReleaseName'

charts/abtest-model/templates/deployment.yaml

@@ -27,5 +27,4 @@ spec:
           containerPort: 5001
         - name: probe
           containerPort: 8086
-      imagePullSecrets:
-        - name: aks-secret     
+