docs(docker): use lockfile-based installs and document alternative base image

[singhvishalkr]

Improves the Docker installation documentation with two changes:

Reproducible installs:

• Development Dockerfiles: yarn install --frozen-lockfile / npm ci instead of plain yarn install / npm install
• Production Dockerfiles: same lockfile flags for consistency
• Ensures container builds are deterministic and match the lockfile exactly

Alternative base image note:

• Added a tip about using node:22-slim (Debian-based) instead of node:22-alpine for environments with restricted network access
• Sharp's prebuilt binaries work out of the box on Debian, avoiding the need to compile libvips from source
• Addresses the DNS/network issues reported in [Bug]: General improvements to the example dockerfile #2577

Closes #2577

[vercel]

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Project	Deployment	Actions	Updated (UTC)
documentation	Ready	Preview, Comment	Apr 11, 2026 2:52pm