♻️(dev) refacto tilt stack

To be able to move the repository on the new organization and to
facilitate external developer integration we need to create a standalone
dev stack and use external secret.

bin/Tiltfile

@@ -29,7 +29,7 @@ docker_build(
     ]
 )
 
-k8s_yaml(local('cd ../src/helm && helmfile -n desk -e dev template .'))
+k8s_yaml(local('cd ../src/helm && helmfile -n desk -e ${DEV_ENV:-dev} template .'))
 
 migration = '''
 set -eu