valheim: add page

[ivanbaluta]

Part of #17125

If you are a new contributor to the project, do not use AI to generate pages. We will close any PR with a suspicion of AI usage.

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[Managor]

Scroll down to "List of console commands" in the page and add some of those as an example. I think at least -port, -password, and -public should be reasonable to document.

[ivanbaluta]

Scroll down to "List of console commands" in the page and add some of those as an example. I think at least -port, -password, and -public should be reasonable to document.

Thanks for the feedback.
I've run into a technical dilemma here and would love your guidance.
"List of console commands" are arguments for the valheim_server.x86_64 binary. However, this binary cannot be run directly. It requires specific environment variables (like LD_LIBRARY_PATH) to be set first, which is handled by the official start_server.sh wrapper script.
If we document the binary directly with its flags (like -port, -password), the examples won't work for a user who just copies them, because the required environment will be missing.
This creates a conflict:

1. We can document start_server.sh, which is runnable but hides the useful flags.
2. We can document the binary valheim_server.x86_64 with its flags, but the examples won't be runnable out-of-the-box.

[Managor]

Does the .sh file not pass the arguments forward?

[ivanbaluta]

No, it doesn't. The script isn't designed to pass arguments; configuration is meant to be done by editing the script itself.

[Managor]

Well that sucks. Add that info as a second line in the header.