feat(oc11): add occ subcommand support and document usage

[DeepDiver1975]

Summary

• Bumps owncloud/base:24.04 digest to pick up the new occ subcommand (landed in owncloud-docker/base#462)
• Documents the new subcommand in README.md under ## Running occ commands

The occ subcommand was initially added as an overlay in this repo, then moved to the base image where it belongs. This PR now just pins the updated base digest and adds the docs.

Usage

docker-compose.yml:

command: ["/usr/bin/owncloud", "occ", "<occ-command>", "<args...>"]

docker run:

docker run --rm --network <oc-network> \
  -e OWNCLOUD_DB_TYPE=mysql \
  -e OWNCLOUD_DB_HOST=db \
  -e OWNCLOUD_DB_NAME=owncloud \
  -e OWNCLOUD_DB_USERNAME=owncloud \
  -e OWNCLOUD_DB_PASSWORD=owncloud \
  owncloud/server \
  /usr/bin/owncloud occ <occ-command> [args...]

Example — start the Windows Network Drive SMB listener:

command: ["/usr/bin/owncloud", "occ", "wnd:listen", "myhost", "myshare", "myuser", "--password-file=/run/secrets/wnd_password"]

Test Plan

• Build oc11 image with updated base digest
• Run command: ["/usr/bin/owncloud", "occ", "list"] — verify occ command list prints, no Apache started, container exits 0
• Verify existing server, install, migrate, installed subcommands still work normally

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