Hello,

In order to optimize costs and to improve system security, I think it is worth adding the option to disable DAG synchronization in the web container, if the user has enabled DAG synchronization. 

> With DAG Serialization we aim to decouple the webserver from DAG parsing which would make the Webserver very light-weight.

https://airflow.readthedocs.io/en/latest/dag-serialization.html

Best regards,
Kamil Breguła
chart/tests/test_git_sync_webserver.py
def test_should_add_dags_volume_to_the_webserver_if_git_sync_and_persistence_is_enabled(self):
        docs = render_chart(
            values={"dags": {"gitSync": {"enabled": True}, "persistence": {"enabled": True}}},
            show_only=["templates/webserver/webserver-deployment.yaml"],
        )
        assert "dags" == jmespath.search("spec.template.spec.volumes[1].name", docs[0])
    def test_should_add_dags_volume_to_the_webserver_if_git_sync_is_enabled_and_persistence_is_disabled(self):
        docs = render_chart(
            values={"dags": {"gitSync": {"enabled": True}, "persistence": {"enabled": False}}},
            show_only=["templates/webserver/webserver-deployment.yaml"],
        )
        assert "dags" == jmespath.search("spec.template.spec.volumes[1].name", docs[0])
    def test_should_add_git_sync_container_to_webserver_if_persistence_is_not_enabled_but_git_sync_is(self):
        docs = render_chart(
            values={
                "dags": {
                    "gitSync": {"enabled": True, "containerName": "git-sync"},
                    "persistence": {"enabled": False},
                }
            },
            show_only=["templates/webserver/webserver-deployment.yaml"],
        )
        assert "git-sync" == jmespath.search("spec.template.spec.containers[0].name", docs[0])
    def test_should_have_service_account_defined(self):
        docs = render_chart(
            values={"dags": {"gitSync": {"enabled": True}, "persistence": {"enabled": True}}},
            show_only=["templates/webserver/webserver-deployment.yaml"],
        )
        assert "RELEASE-NAME-webserver" == jmespath.search("spec.template.spec.serviceAccountName", docs[0])