feat(labrinth): environment variables for more customizable SMTP (#2886)

* refactor: move .env to .env.example

* refactor(labrinth): allow setting SMTP port and TLS

This will help setting up labrinth for local development. You can now use a mock SMTP server such as smtp4dev. The TLS options will stay the same as before if set to `true`, and disabled when `false`.

Depends on #2883

* chore(labrinth): lint

* chore(labrinth): conflicts

* chore(labrinth): conflicts

* fix: use TLS port by default

Co-authored-by: AlexTMjugador<me@alegon.dev>

Co-authored-by: Alejandro González <7822554+AlexTMjugador@users.noreply.github.com>
Signed-off-by: Erb3 <49862976+Erb3@users.noreply.github.com>

* fix(labrinth): correct deafult SMTP port in .env

* feat(labrinth): expose all SMTP TLS settings

Replaced if/else with a switch statement. The new values for `SMPT_TLS` are `none`, `opportunistic_start_tls`, `requires_start_tls`, `tls`. When none of these values are supplied, it defaults to full TLS (`tls`), and throws a warning.

Resolves PR review

* fix(labrinth): correct SMTP TLS example .env setting

Signed-off-by: Erb3 <49862976+Erb3@users.noreply.github.com>

* fix(labrinth) SMTP tls env var check

Co-authored-by: Alejandro González <7822554+AlexTMjugador@users.noreply.github.com>
Signed-off-by: Erb3 <49862976+Erb3@users.noreply.github.com>

---------

Signed-off-by: Erb3 <49862976+Erb3@users.noreply.github.com>
Co-authored-by: Alejandro González <7822554+AlexTMjugador@users.noreply.github.com>

apps/labrinth/.env

@@ -84,6 +84,8 @@ HCAPTCHA_SECRET=none
 SMTP_USERNAME=none
 SMTP_PASSWORD=none
 SMTP_HOST=none
+SMTP_PORT=465
+SMTP_TLS=tls
 
 SITE_VERIFY_EMAIL_PATH=none
 SITE_RESET_PASSWORD_PATH=none