Remove Redis TTL (#1696)

* Remove Redis TTL

Prior to sccache 0.4.x there was no per key TTL applied to Redis. Long
term we probably want to make this configurable, but for now restoring
the initial behavior of letting Redis control when the keys expire.

* Removed unused duration

src/cache/redis.rs

@@ -18,7 +18,6 @@ use opendal::layers::LoggingLayer;
 use opendal::services::Redis;
 use opendal::Operator;
 use std::collections::HashMap;
-use std::time::Duration;
 use url::Url;
 
 /// A cache that stores entries in a Redis.
@@ -33,8 +32,6 @@ impl RedisCache {
         builder.endpoint(parsed.as_str());
         builder.username(parsed.username());
         builder.password(parsed.password().unwrap_or_default());
-        // Set default ttl to 24 hours.
-        builder.default_ttl(Duration::from_secs(24 * 3600));
 
         let options: HashMap<_, _> = parsed
             .query_pairs()