add: dockerfile and docker ignore rules

.dockerignore

@@ -0,0 +1,4 @@
+.DS_Store
+.git
+.runtime
+node_modules

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:22-bookworm-slim
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+ENV HOST=0.0.0.0
+ENV PORT=80
+
+EXPOSE 80
+
+CMD ["npm", "start"]