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check-docker-layer-efficiency

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Checks Docker layer efficiency for PHP builds. Analyzes layer ordering, cache utilization, and identifies optimization opportunities.

skills/check-docker-layer-efficiency/SKILL.md

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# Docker Layer Efficiency Checker

Analyze Dockerfile layer structure for optimal ordering, cache utilization, and build performance.

## Optimal Layer Ordering

| Order | Layer Type | Change Frequency | Example |
|-------|-----------|------------------|---------|
| 1 | Base image | Rare | `FROM php:8.4-fpm` |
| 2 | System deps | Rare | `RUN apt-get install` |
| 3 | PHP extensions | Rare | `RUN docker-php-ext-install` |
| 4 | Composer deps | Weekly | `COPY composer.* && composer install` |
| 5 | NPM deps | Weekly | `COPY package.* && npm ci` |
| 6 | Config files | Occasional | `COPY php.ini, nginx.conf` |
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