Add Docker configuration and .dockerignore for Serena application

.dockerignore

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+# Git
+.git
+.gitignore
+
+# Documentation
+README.md
+LICENSE
+*.md
+
+# Node modules (will be installed in container)
+frontend/node_modules
+node_modules
+
+# Build artifacts
+backend/build
+frontend/build
+backend/.gradle
+backend/bin
+
+# IDE files
+.vscode
+.idea
+*.iml
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Environment files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+
+# Dependency directories
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity