Support for deploying using Cloudron

[mayel]

I have created a basic config for cloudron, which installs ok but doesn't yet run successfully:

• not sure how to set required env vars, for example for generated secrets a workaround for now is running just cloudron-secrets-generate once the app is running
• database connection doesn't work: [error] Postgrex.Protocol (#PID<0.7991.0>) failed to connect: ** (Postgrex.Error) FATAL 28000 (invalid_authorization_specification) no pg_hba.conf entry for host "172.x.x.x", user "user5bc5f11eba2b43b7816d0bf548311a27", database "postgres", no encryption
• haven't been able to test if it the rest runs correctly, notably the meilisearch container