Use a craft-providers callback hook to set the apt proxy by an app config

[lengau]

What needs to get done

In the provider service, when creating an instance, send a callback to craft-providers (see: canonical/craft-providers#665).

The default implementation of this callback should use the config service to get the app's apt_proxy configuration and use it to configure the proxy in apt. This is roughly what's done in

craft-application/craft_application/fetch.py

Lines 388 to 405 in c971a60

	def _configure_apt(instance: craft_providers.Executor, net_info: NetInfo) -> None:
	apt_config = f'Acquire::http::Proxy "{net_info.http_proxy}";\n'
	apt_config += f'Acquire::https::Proxy "{net_info.http_proxy}";\n'
	instance.push_file_io(
	destination=pathlib.Path("/etc/apt/apt.conf.d/99proxy"),
	content=io.BytesIO(apt_config.encode("utf-8")),
	file_mode="0644",
	)
	instance.execute_run( # pyright: ignore[reportUnknownMemberType]
	["/bin/rm", "-Rf", "/var/lib/apt/lists"],
	check=True,
	)
	env = cast(dict[str, str | None], net_info.env)
	with emit.open_stream() as fd:
	instance.execute_run( # pyright: ignore[reportUnknownMemberType]
	["apt", "update"], env=env, check=True, stdout=fd, stderr=fd
	)

When doing this, have the fetch service use this.

Why it needs to get done

Allow apt proxies in craft apps

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3462.

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