Workspace root Cargo.toml not counted in cache key if it is not a package

[Charlie-XIAO]

If the root Cargo.toml does not correspond to a package (i.e., it is a virtual root), it seems that this file won't be counted into the computation of the cache key.

rust-cache/src/config.ts

Lines 155 to 157 in a1f9490

	const workspaceMembers = await workspace.getWorkspaceMembers();
	const cargo_manifests = sort_and_uniq(workspaceMembers.map((member) => path.join(member.path, "Cargo.toml")));

Hence changing [profile.dev] in the root Cargo.toml seems to give a full match which is problematic.

[lann]

Ran into this same problem. A workaround:

uses: Swatinem/rust-cache@v2
with:
    key: workspace-root-${{ hashFiles('Cargo.toml') }}