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DAL: add NGINX template for serving slot_store + fix directory permissions

Mohamed IGUERNLALArequested to merge
iguerNL@nginx-config-to-serve-DAL-slot-store into master

What

This MR provides a minimal, production-ready NGINX configuration to serve the contents of a DAL node's slot_store directory over HTTP.

It also adjusts the file system permissions to ensure that group and others have appropriate read access (+r) on the relevant store directories, allowing NGINX to serve the files even when running under a different user than the DAL node.

Why

This setup enables DAL nodes using the --http-backup option to retrieve missing slots from external servers, which is needed for Etherlink DAL data retrievability

Examples:

(Ask me for the actual host on Slack 🙂)

  • Fetch a single slot with wget:
wget http://<host>/v0/slots/by_published_level/12552092_30_126944
  • Fetch a single slot with wget:
curl http://<host>/v0/slots/by_published_level/12552092_30_126944 --output 12552092_30_126944

Mirror the full store locally:

wget --mirror \
  --no-parent \
  --no-host-directories \
  --cut-dirs=3 \
  --directory-prefix=store/slot_store \
  --accept-regex '[0-9]+_[0-9]+_[0-9]+' \
  --reject "index.html*" \
  http://<host>/v0/slots/by_published_level/

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