fix: explicit comparison for boolean-like value

src/setup.ts

@@ -43,7 +43,7 @@ async function setup() {
  // Search local file system cache for sccache.
  // This is useful when actions run on a self-hosted runner.
  let sccacheHome = find('sccache', version);
- if (!sccacheHome) {
+ if (sccacheHome === '') {
  const sccachePath = await downloadSCCache(version);
  if (sccachePath instanceof Error) {
  core.setFailed(sccachePath.message);