Added Docker workflow

.dockerignore

@@ -0,0 +1,36 @@
+# Dependencies
+node_modules
+
+# Next.js build output (rebuilt in Docker)
+.next
+
+# Local env files (pass secrets via Docker env, not baked into image)
+.env.local
+.env*.local
+
+# Dev / editor artifacts
+.git
+.gitignore
+*.md
+.vscode
+.idea
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+npm-debug.log*
+
+# Data directories (mounted as volumes)
+data
+mc-data
+backups
+
+# Test / CI
+coverage
+.nyc_output
+
+# Misc
+*.tsbuildinfo