List enabled Query Runner types during build (#4166)

* Add CLI command to list enabled query runner types

.circleci/config.yml

@@ -32,6 +32,9 @@ jobs:
       - run:
           name: Create Test Database
           command: docker-compose run --rm postgres psql -h postgres -U postgres -c "create database tests;"
+      - run:
+          name: List Enabled Query Runners
+          command: docker-compose run --rm redash manage ds list_types
       - run:
           name: Run Tests
           command: docker-compose run --name tests redash tests --junitxml=junit.xml --cov-report xml --cov=redash --cov-config .coveragerc tests/

redash/cli/data_sources.py

@@ -35,6 +35,15 @@ def list(organization=None):
             ds.id, ds.name, ds.type, ds.options.to_json()))
 
 
+@manager.command()
+def list_types():
+    print("Enabled Query Runners:")
+    types = sorted(query_runners.keys())
+    for query_runner_type in types:
+        print(query_runner_type)
+    print("Total of {}.".format(len(types)))
+
+
 def validate_data_source_type(type):
     if type not in query_runners.keys():
         print("Error: the type \"{}\" is not supported (supported types: {})."