.gitignore: Extend.

Change-Id: I677e4c41f0ea30ff9482420139176d50fc061ba9
diff --git a/.gitignore b/.gitignore
index 1995b90..b8b3920 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,8 +2,15 @@
 #
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
+*.iml
+*_BACKUP_*
+*_BASE_*
+*_LOCAL_*
+*_REMOTE_*
 *~
+.envrc
 .flattened-pom.xml
 /.idea
-/target
 /jgvariant-*/target
+/target
+dependency-reduced-pom.xml