Be more lenient when repackage is invoked several times

This commit makes the repackager more lenient when it is invoked several
times in the same lifecycle.

Closes gh-15034

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/Repackager.java

@@ -179,11 +179,11 @@ public class Repackager {
 		if (this.layout == null) {
 			this.layout = getLayoutFactory().getLayout(this.source);
 		}
-		if (alreadyRepackaged()) {
-			return;
-		}
 		destination = destination.getAbsoluteFile();
 		File workingSource = this.source;
+		if (alreadyRepackaged() && this.source.equals(destination)) {
+			return;
+		}
 		if (this.source.equals(destination)) {
 			workingSource = getBackupFile();
 			workingSource.delete();