Please provide "placeholders" or DOCs on  what variables to populate in ./.settings.env

all services secrets seems to be neatly packed in per service  ./.settings.env files. But there seems to be no placeholders or alike.  Would you be so kind to provide them, e.g. doing smth like

```
sed 's/^\([A-Za-z_][A-Za-z0-9_]*\)=[^#]*/\1=...    /' .settings.env > .settings.env.template
```

after .gitignore'ing .settings.env altogether to not commit .