Ignore tool files and directories

Author: alexander-yevsyukov

.gitignore

@@ -31,6 +31,13 @@
 #
 # Therefore, instructions below are superset of instructions required for all the projects.
 
+# `jenv` local configuration.
+.java-version
+
+# Internal tool directories.
+.fleet/
+.kotlin/
+
 # IntelliJ IDEA modules and interim config files.
 *.iml
 .idea/*.xml
@@ -54,6 +61,7 @@
 
 # Gradle build files
 **/build/**
+!**/src/**/build/**
 
 # Build files produced by the IDE
 **/out/**