Allow missing default entry-point in ato.yaml

[mawildoer]

This would mean you can run a build manually via the CLI as long as the entry-point is provides as an argument.

See

atopile/src/atopile/cli/common.py

Lines 119 to 135 in fa35883

	if build_names := build or config.builds.keys():
	build_ctxs: list[atopile.config.BuildContext] = [
	atopile.config.BuildContext.from_config_name(config, build_name)
	for build_name in build_names
	]
	else:
	build_ctxs = [atopile.config.BuildContext.from_config(
	"default",
	atopile.config.ProjectBuildConfig(),
	project_ctx
	)]
	for build_ctx in build_ctxs:
	if entry_addr_override is not None:
	build_ctx.entry = entry_addr_override
	if target:
	build_ctx.targets = list(target)