Implement archive cleanup (#885)

* Implement archive cleanup

Fixes #769

Signed-off-by: Andrew <write@imaginarycode.com>

* Make sure to close the directory file

* Resolve issues noted by @strk

* edit cheatsheet app.ini [ci skip]

* oops [ci skip]

modules/setting/setting.go

@@ -307,6 +307,12 @@ var (
 			RunAtStart bool
 			Schedule   string
 		} `ini:"cron.check_repo_stats"`
+		ArchiveCleanup struct {
+			Enabled    bool
+			RunAtStart bool
+			Schedule   string
+			OlderThan  time.Duration
+		} `ini:"cron.archive_cleanup"`
 	}{
 		UpdateMirror: struct {
 			Enabled    bool
@@ -334,6 +340,16 @@ var (
 			RunAtStart: true,
 			Schedule:   "@every 24h",
 		},
+		ArchiveCleanup: struct {
+			Enabled    bool
+			RunAtStart bool
+			Schedule   string
+			OlderThan  time.Duration
+		}{
+			RunAtStart: true,
+			Schedule:   "@every 24h",
+			OlderThan:  24 * time.Hour,
+		},
 	}
 
 	// Git settings