Devenvify project, remove Docker Compose dependency

[thenonameguy]

No description provided.

[domenkozar]

Why do we need this file?

[thenonameguy]

I was suprised myself, in a Flake context you would assume the Flake's devenv input governs the exact devenv version used. This is not the case the devenv has it's own internal Flake file, which uses a separate input when you invoke any devenv up command for example.

Proof:

$ rm devenv.yaml
$ devenv up
Building shell ...
warning: updating lock file '/home/kszabo/projects/realworld-v1-rust-actix-web-diesel/devenv.lock':
• Updated input 'devenv':
    'github:thenonameguy/devenv/4717da802b1868318ab60758c244c4b37774f426' (2022-12-20)
  → 'github:cachix/devenv/27f490910057a989ecac0851c5d3085bcebe1093?dir=src%2fmodules' (2022-12-19)
• Removed input 'devenv/flake-compat'
• Removed input 'devenv/nix'
• Removed input 'devenv/nix/lowdown-src'
• Removed input 'devenv/nix/nixpkgs'
• Removed input 'devenv/nix/nixpkgs-regression'
• Removed input 'devenv/nixpkgs'
• Removed input 'devenv/pre-commit-hooks'
• Removed input 'devenv/pre-commit-hooks/flake-compat'
• Removed input 'devenv/pre-commit-hooks/flake-utils'
• Removed input 'devenv/pre-commit-hooks/gitignore'
• Removed input 'devenv/pre-commit-hooks/gitignore/nixpkgs'
• Removed input 'devenv/pre-commit-hooks/nixpkgs'
• Removed input 'devenv/pre-commit-hooks/nixpkgs-stable'
warning: applying 'toString' to path '/home/kszabo/projects/realworld-v1-rust-actix-web-diesel/devenv.nix' and then accessing it is deprecated, at «stdin»:0
error:
       … while evaluating the attribute 'config'

       at «github:NixOS/nixpkgs/bb31220cca6d044baa6dc2715b07497a2a7c4bc7»/lib/modules.nix:341:9:

          340|         options = checked options;
          341|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          342|         _module = checked (config._module);
       The option `services.postgres.initialDatabases' does not exist. Definition values:
       - In `/home/kszabo/projects/realworld-v1-rust-actix-web-diesel/devenv.nix':
           [
             {
               name = "realworld-rust-actix-web";
               schema = <derivation init.sql>;
             }
           ...
direnv: loading ~/projects/realworld-v1-rust-actix-web-diesel/.envrc

This is a huge UX painpoint with Flake-based usage, as you have keep track of inputs in 2 places so you don't end up in inconsistent scenarios.

[domenkozar]

devenv up will only work with devenv.* files, avoiding the flakes. This is a drawback from the current use of flakes integration. Can be fixed though, could you open an issue please?