Add Support for Loading Environment Variables from .env Files

[JamborJan]

Hello Telmate/proxmox-api-go maintainers,

I am just starting to contribute to the Proxmox ecosystem. I want to see a nice and useful terraform provider and do my part to it. As I learned now the Telmate/proxmox-api-go is the first crucial thing and I cloned the repo to play around with it to get started.

My Motivation:
When it came to exporting environment variables to setup the configuration, I thought .env files would be a nice thing to have. I usually have multiple small projects ongoing at the same time and always having to type export KEY=value is error prone and as it is part of the bash history also insecure.

Implementation:
To address this, I have integrated the godotenv package, which allows the application to automatically load environment variables from a .env file at runtime. This means users can now store their sensitive credentials safely in .env files, significantly reducing the risk of accidental exposure, mixing up things etc. I also added .env to the gitignore file, everybody should know that this is a sensitive file which must not be shared.

Changes Made:

• Added godotenv as a dependency in go.mod.
• Implemented .env file loading logic in the main initialization section of the application.
• Updated the README.md to include instructions on how to use .env files with the Proxmox API Go client.

Thank you for considering my PR.

[mleone87]

@JamborJan please fix linting issues

[JamborJan]

Hi @mleone87, I guess you asked me to fix the staticcheck error. I did that. Fixing the linting would involve a ton of work as the whole project is not properly setup. I can do that. But I would prefer to do this in a separate issue / pull request to not have scope creep in this specific PR. Are you okay with that? Thank you.

[mleone87]

@JamborJan it's ok I was just referring to the lint error on this commit, other are warnings!

[JamborJan]

Thank you @mleone87 . Anyway if we want to get rid of the warnings I can do that. Sort of a probation to get my credits for becoming a proper contributor 😅