chore: ignore packer plugin files

.gitignore

@@ -2,21 +2,27 @@
 **/credentials*
 
 # Configurations
-## Ignore default config directory.
+# Ignore default config directory.
 config/
 
 # Manifests
-## Ignore manifests directory.
+# Ignore manifests directory.
 manifests/*.json
 
 # MacOS
-## Ignore desktop services files.
+# Ignore desktop services files.
 **/.DS_Store
 
 # Certificates and Keys
-## Ignore certificates files.
+# Ignore certificates files.
 **/*.cer
 **/*.crt
 **/*.p7b
-## Ignore public key files
+
+# Ignore public key files
 **/*.pub
+
+# Ignore packer plugin files
+plugin.hwm
+plugin.pwd
+plugin.pwi