Update env and optional variables

Salesforce.gitignore

@@ -1,3 +1,14 @@
+# Optional variables
+.docker
+data
+
+# Environment variables
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
 # This file is used for Git repositories to specify intentionally untracked files that Git should ignore. 
 # If you are not using git, you can delete this file. For more information see: https://git-scm.com/docs/gitignore
 # For useful gitignore templates see: https://github.com/github/gitignore