chore(ci): deploy blog from CI

.agola/config.yml

@@ -15,7 +15,7 @@ runs:
                   dest_dir: .
                   paths:
                     - '**'
-      - name: build docker image
+      - name: Build
         runtime:
           containers:
             - image: gcr.io/kaniko-project/executor:debug
@@ -46,3 +46,13 @@ runs:
                   --dockerfile /root/project/Dockerfile
         depends:
           - checkout code
+      - name: Deploy
+        runtime:
+          containers:
+            - image: docker.io/alpine/helm
+        steps:
+          - restore_workspace:
+              dest_dir: .
+          - run:
+              name: Deploy Helm chart
+              command: helm upgrade --set image.tag=$AGOLA_GIT_COMMITSHA --install --namespace blog deploy/helm blog