@berkcangumusisik/docker-build

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name: docker-build description: Creates or optimizes a Dockerfile for the current project user-invocable: true allowed-tools: Read Glob Bash Edit effort: medium

Docker Setup

1. Detect project type:

cat package.json 2>/dev/null | grep '"main"\|"start"\|"scripts"' -A 5
ls -la | grep -E "Dockerfile|docker-compose|\.dockerignore"

2. If Dockerfile exists, review it for:

   • Multi-stage build (build stage vs runtime stage)
   • Layer caching order (dependencies before source)
   • Running as non-root user
   • .dockerignore completeness
   • Image size optimization

3. If no Dockerfile, generate one following best practices:

# Multi-stage: build → runtime
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production

FROM node:20-alpine AS runtime
RUN addgroup -S app && adduser -S app -G app
WORKDIR /app
COPY --from=builder /app/node_modules ./node_modules
COPY . .
USER app
EXPOSE 3000
CMD ["node", "dist/index.js"]

4. Also create/update .dockerignore:

node_modules
dist
.env*
.git
coverage
*.test.*

5. Show docker build and docker run commands to test.