Add UV_CUSTOM_COMPILE_COMMAND support to uv pip compile

[BakerNet]

Summary

This adds support for CUSTOM_COMPILE_COMMAND support to change the header comment in generated requirements files.

See Issue:

• support CUSTOM_COMPILE_COMMAND #1527

From pip-tools docs:

You might be wrapping the pip-compile command in another script. To avoid confusing consumers of your custom script you can override the update command generated at the top of requirements files by setting the CUSTOM_COMPILE_COMMAND environment variable.

Test Plan

See unit test included

[BakerNet]

Alternatively, if you prefer to have it inline:

Suggested change

	cmd(
	include_index_url,
	include_find_links,
	custom_compile_command
	)
	custom_compile_command.unwrap_or(cmd(include_index_url, include_find_links))

and revert the changes in cmd function

[BakerNet]

If above suggestion, revert

Suggested change

	fn cmd(
	include_index_url: bool,
	include_find_links: bool,
	custom_compile_command: Option<String>,
	) -> String {
	if let Some(cmd_str) = custom_compile_command {
	return cmd_str;
	}
	fn cmd(include_index_url: bool, include_find_links: bool) -> String {

[konstin]

Thank you!

[henryiii]

This adds UV_CUSTOM_COMPILE_COMMAND, not CUSTOM_COMPILE_COMMAND. Both the PR and the release notes state the CUSTOM_COMPILE_COMMAND one, which is the same as pip compile, but this was added with a UV_ prefix.

[henryiii]

(I read the release notes, then couldn't figure out why CUSTOM_COMPILE_COMMAND that was previously set for pip-compile wasn't now working for uv until I read the diff)

[konstin]

Thanks, i updated the release notes.