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node-docker.sh

node-docker.sh: Create Docker-backed Node.js launchers (node, npm, npx, yarn)
Usage (via loader):
  load.sh node-docker -- <node_version>


Examples:
  load.sh node-docker -- 22
  load.sh node-docker -- 20

Description:
- Generates wrapper scripts in "$HOME/.shellscript/bin" for the selected Node version:
    - node<ver> → runs Node inside node:<ver>-alpine
    - npm<ver>  → runs npm inside node:<ver>-alpine (persisting ~/.npm and honoring ~/.npmrc)
    - npx<ver>  → runs npx inside node:<ver>-alpine
    - yarn<ver> → runs yarn inside node:<ver>-alpine (persisting ~/.cache/yarn)
- Also updates convenience symlinks: node, npm, npx, yarn → their <ver> counterparts.
- Pulls the specified Docker image and marks the wrappers executable.
- Intended for environments where Node.js tooling is not installed natively.

Notes:
- Typical versions: 18, 20, 22 (any tag supported by docker hub node:<tag>-alpine)
- Requires Docker installed and available on PATH. Install with `load.sh docker`
- This script is idempotent and can be re-run to switch versions.

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