Use 0 days for default CacheValidity

Signed-off-by: Cody Soyland <codysoyland@github.com>

pkg/tuf/options.go

@@ -29,7 +29,7 @@ const DefaultMirror = "https://tuf-repo-cdn.sigstore.dev"
 
 // Options represent the various options for a Sigstore TUF Client
 type Options struct {
- // CacheValidity period in days (default 1)
+ // CacheValidity period in days (default 0)
  CacheValidity int
  // ForceCache controls if the cache should be used without update
  // as long as the metadata is valid
@@ -110,7 +110,6 @@ func DefaultOptions() *Options {
  // Fall back to using a TUF repository in the temp location
  home = os.TempDir()
  }
- opts.CacheValidity = 1
  opts.CachePath = filepath.Join(home, ".sigstore", "root")
  opts.RepositoryBaseURL = DefaultMirror