refactor(logging): add a logging abstraction and move the job logger onto it (#1295)

Add `act/common/logging`: a printf-style `Logger` on a slog-shaped `Handler`, with a logrus-backed handler as the only backend, plus a `logtest` handler for tests. Move the job logger onto it: `common.Logger` returns `*logging.Logger`, the job log formatters and the `Reporter` hook become handlers, and composite step IDs travel in the context.

Logging is tightly coupled to logrus types (hooks, formatters, `Entry.Data`). Going through our own interface first lets the remaining call sites move over with unchanged behavior, and lets the backend be swapped for `log/slog` in one place afterwards. The global process logger and its masking formatter stay on logrus for now.

Assisted-by: Codet
Co-authored-by: bircni <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1295
Reviewed-by: bircni <[email protected]>

internal/app/cmd/cache-server.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 
 	"gitea.com/gitea/runner/act/artifactcache"
+	"gitea.com/gitea/runner/act/common/logging"
 	"gitea.com/gitea/runner/internal/app/run"
 	"gitea.com/gitea/runner/internal/pkg/config"
 
@@ -60,7 +61,7 @@ func runCacheServer(configFile *string, cacheArgs *cacheServerArgs) func(cmd *co
 			Port:           port,
 			InternalSecret: secret,
 			Policy:         run.CachePolicy(cfg),
-			Logger:         log.StandardLogger().WithField("module", "cache_request"),
+			Logger:         logging.Default().With("module", "cache_request"),
 		})
 		if err != nil {
 			return err