feat: add general occ subcommand to owncloud entrypoint

[DeepDiver1975]

Summary

• Adds a new occ subcommand to /usr/bin/owncloud in the v24.04 image
• Runs full ownCloud initialization (/etc/owncloud.d/*.sh) then execs occ with forwarded arguments — without starting Apache
• Applies to any image built on owncloud/base:24.04

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...]

Examples:

List all available occ commands:

# docker run
docker run --rm ... owncloud/server /usr/bin/owncloud occ list

# docker-compose
command: ["/usr/bin/owncloud", "occ", "list"]

Start the Windows Network Drive SMB listener (long-running):

# docker run
docker run \
  --network <oc-network> \
  -e OWNCLOUD_DB_TYPE=mysql \
  ... \
  owncloud/server \
  /usr/bin/owncloud occ wnd:listen myhost myshare myuser --password-file=/run/secrets/wnd_password

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

Test Plan

• Build owncloud/base:24.04 with this change
• 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

Related

Companion PR in owncloud-docker/server: owncloud-docker/server#618 (will be updated to drop the overlay once this merges)

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