add 'serverless: true' to pipeline

acceptance/bundle/templates/default-python/classic/out.compare-vs-serverless.diff

@@ -37,3 +37,11 @@
 +            autoscale:
 +                min_workers: 1
 +                max_workers: 4
+--- [TESTROOT]/bundle/templates/default-python/classic/../serverless/output/my_default_python/resources/my_default_python.pipeline.yml
++++ output/my_default_python/resources/my_default_python.pipeline.yml
+@@ -6,5 +6,4 @@
+       catalog: main
+       target: my_default_python_${bundle.target}
+-      serverless: true
+       libraries:
+         - notebook:

acceptance/bundle/templates/default-python/serverless/output/my_default_python/resources/my_default_python.pipeline.yml

@@ -5,6 +5,7 @@ resources:
       name: my_default_python_pipeline
       catalog: main
       target: my_default_python_${bundle.target}
+      serverless: true
       libraries:
         - notebook:
             path: ../src/dlt_pipeline.ipynb

libs/template/templates/default-python/template/{{.project_name}}/resources/{{.project_name}}.pipeline.yml.tmpl

@@ -1,3 +1,7 @@
+{{$with_serverless := (eq .serverless "yes") -}}
+{{if (eq .serverless "auto") -}}
+    {{$with_serverless = is_serverless_supported -}}
+{{end -}}
 # The main pipeline for {{.project_name}}
 resources:
   pipelines:
@@ -10,6 +14,9 @@ resources:
       catalog: {{default_catalog}}
       {{- end}}
       target: {{.project_name}}_${bundle.target}
+      {{- if $with_serverless }}
+      serverless: true
+      {{- end}}
       libraries:
         - notebook:
             path: ../src/dlt_pipeline.ipynb