feat: add .dockerignore and update Dockerfile for improved caching

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:18-alpine AS base
+FROM node:lts-alpine AS base
 
 # Install dependencies only when needed
 FROM base AS deps
@@ -10,7 +10,7 @@ RUN corepack enable
 COPY .yarn ./.yarn
 COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* .yarnrc.yml ./
 
-RUN yarn --frozen-lockfile
+RUN yarn && rm -rf .yarn/cache .yarn/unplugged .yarn/build-state.yml
 
 
 # Rebuild the source code only when needed