Fail hard if S3 cache access fails

Author: csweichel

Diff for: cmd/root.go

@@ -178,11 +178,10 @@ func getRemoteCache() leeway.RemoteCache {
 		case "AWS":
 			rc, err := leeway.NewS3RemoteCache(remoteCacheBucket, nil)
 			if err != nil {
-				log.Warnf("S3 cache initialization failed; remote cache will be disabled: %s", err)
-				return leeway.NoRemoteCache{}
-			} else {
-				return rc
+				log.Fatalf("cannot access remote S3 cache: %v", err)
 			}
+
+			return rc
 		default:
 			return leeway.GSUtilRemoteCache{
 				BucketName: remoteCacheBucket,