feat: add option to cache all crates (#137)

Add cache-all-crates option which allows all crates to be cached instead
of just the dependency crates. This is useful when additional crates are
required for CI tooling.

src/cleanup.ts

@@ -85,7 +85,7 @@ export async function cleanBin() {
   }
 }
 
-export async function cleanRegistry(packages: Packages) {
+export async function cleanRegistry(packages: Packages, crates = true) {
   // `.cargo/registry/src`
   // we can remove this completely, as cargo will recreate this from `cache`
   await rmRF(path.join(CARGO_HOME, "registry", "src"));
@@ -106,6 +106,11 @@ export async function cleanRegistry(packages: Packages) {
     }
   }
 
+  if (!crates) {
+    core.debug(`skipping crate cleanup`);
+    return;
+  }
+
   const pkgSet = new Set(packages.map((p) => `${p.name}-${p.version}.crate`));
 
   // `.cargo/registry/cache`