Because handlebars yanked a version which was there for a few days, we
need to downgrade this crate. In this process update all the others.

Fixes #4307

Also check if we are running within a Kubernetes environment.
These do not always run using Docker or Podman of course.

Also renamed all the functions and variables to use `container` instead
of `docker`.

- Update the workflow GH Actions.
- Configured the release workflow to always run on main/tag as discussed
  in #4226

Closes #4226

- Updated Rust to v1.76.0
- Updated crates
- Updated web-vault to v2024.1.2b
- Fixed some Clippy lints
- Moved lint check configuration Cargo.toml
- Fixed issue with Reset Password Enrollment when logged-in via device

It seems (as disscusses here #4320) a single codegen unit makes it still
crash. This sets it to the default 16 Rust uses for the release profile.

…e parsing (#4315)

* fix: update env template for systemd compatibility

Adjust env template to ensure compatibility with systemd's EnvironmentFile parsing, which only recognizes line-starting comment symbols.

* Refactor SMTP and Rocket settings in .env.template

- Simplify the SMTP_SECURITY and SMTP_PORT options by providing a list of choices and default values
- Clarify the ROCKET_PORT default value depending on the environment (Docker or not)

- Update all crates
- Update GHA
- Update Global Domains script to use main instead of master
  Also fixed some Python linting warnings
- Updated Admin JS and CSS libraries