feat: update Docker configuration for improved performance and add local environment example

.dockerignore

@@ -3,8 +3,9 @@ node_modules
 .turbo
 **/.turbo
 .git
-*.md
 .env*
+!.env.example
+!.env.local.example
 .DS_Store
 apps/e2e
 apps/dev-tool
@@ -16,3 +17,6 @@ apps/dev-tool
 .github
 docs
 **/*.tsbuildinfo
+**/*.md
+!**/AGENTS.md
+!**/CLAUDE.md