[render] Fix stub env value ENV
[render] Fix stub env value ENV

Error: bad Helm release 'project-ENV' rendered by template '[[ project ]]-[[ env ]]': helm release name should be a valid DNS-1123 subdomain and be maximum 53 chars: a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is [a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')

flant/dapp,flant/dapp,flant/dapp