Add debug statement for exact zstd version value and remove dependence on version for now

packages/cache/src/internal/cacheUtils.ts

@@ -100,9 +100,9 @@ async function getVersion(
 export async function getCompressionMethod(): Promise<CompressionMethod> {
   const versionOutput = await getVersion('zstd', ['--quiet'])
   const version = semver.clean(versionOutput)
+  core.debug(`zstd version: ${version}`)
 
-  if (versionOutput === '' || version === null) {
-    // zstd is not installed
+  if (versionOutput === '') {
     return CompressionMethod.Gzip
   } else {
     return CompressionMethod.ZstdWithoutLong