Output network-test logs into files in CI (#6355)

* Add ci_logger

* Update artifact name

* Add env var

* Add fork_name

* Fix clippy error

* Add comments

beacon_node/network/Cargo.toml

@@ -57,3 +57,4 @@ disable-backfill = []
 fork_from_env = ["beacon_chain/fork_from_env"]
 portable = ["beacon_chain/portable"]
 test_logger = []
+ci_logger = []

beacon_node/network/src/sync/block_lookups/tests.rs

@@ -15,7 +15,7 @@ use beacon_chain::data_availability_checker::Availability;
 use beacon_chain::eth1_chain::CachingEth1Backend;
 use beacon_chain::test_utils::{
     build_log, generate_rand_block_and_blobs, generate_rand_block_and_data_columns, test_spec,
-    BeaconChainHarness, EphemeralHarnessType, NumBlobs,
+    BeaconChainHarness, EphemeralHarnessType, LoggerType, NumBlobs,
 };
 use beacon_chain::validator_monitor::timestamp_now;
 use beacon_chain::{
@@ -103,8 +103,14 @@ struct TestRigConfig {
 
 impl TestRig {
     fn test_setup_with_config(config: Option<TestRigConfig>) -> Self {
-        let enable_log = cfg!(feature = "test_logger");
-        let log = build_log(slog::Level::Trace, enable_log);
+        let logger_type = if cfg!(feature = "test_logger") {
+            LoggerType::Test
+        } else if cfg!(feature = "ci_logger") {
+            LoggerType::CI
+        } else {
+            LoggerType::Null
+        };
+        let log = build_log(slog::Level::Trace, logger_type);
 
         // Use `fork_from_env` logic to set correct fork epochs
         let mut spec = test_spec::<E>();