feat(availability): env var to disable pruning

share/availability/window.go

@@ -1,6 +1,9 @@
 package availability
 
-import "time"
+import (
+	"os"
+	"time"
+)
 
 const (
 	RequestWindow = 30 * 24 * time.Hour
@@ -11,8 +14,14 @@ const (
 // given AvailabilityWindow. If the window is disabled (0), it returns true for
 // every timestamp.
 func IsWithinWindow(t time.Time, window time.Duration) bool {
+	if alwaysAvailable {
+		return true
+	}
 	if window == time.Duration(0) {
 		return true
 	}
 	return time.Since(t) <= window
 }
+
+// alwaysAvailable is a flag that disables the availability window.
+var alwaysAvailable = os.Getenv("CELESTIA_PRUNING_DISABLED") == "true"