Feature: SMTP configuration and environment support for ns8-webserver

[stephdl]

Brief description

This feature request follows an implementation proposed in the PR NethServer/ns8-webserver#129.

1. Why: To support smarthost configuration and allow service containers to discover SMTP settings more easily.
2. Purpose: Improve mail delivery flexibility and security, allowing containers to read SMTP environment variables set via an environment file, and ensure the service can access new SMTP settings. Also, update the container to include OpenSSL for secure mail communication.

Proposed solution

• Introduce a script to discover SMTP settings and create an environment file for smarthost configuration.
• Update the container setup to include OpenSSL.
• Ensure the service can access the new SMTP environment variables.

Alternative solutions

• Continue manual setup of SMTP parameters inside containers instead of providing an automated/file-based approach.
• Rely on insecure mail delivery if OpenSSL is not added.

Additional context

• PR link: NethServer/ns8-webserver#129

See also

• https://community.nethserver.org/t/lamp-php-mailer-not-working-after-last-lamp-and-mail-apps-update/26640/6

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thank to Daniel Zeman