fix(entrypoint.sh): Passwords starting with hyphen break `occ mainten…

[flxjoeken]

Issue

If you provide a password starting with a hyphen, the automated installation fails because the occ command parses the password value as a new CLI option.

docker run --rm \
    -e NEXTCLOUD_ADMIN_USER=admin \
    -e NEXTCLOUD_ADMIN_PASSWORD="-starts-with-hyphen" \
    -e SQLITE_DATABASE="sqlite.db" \
    nextcloud:latest

[...]
Starting nextcloud installation
The "--admin-pass" option requires a value.
[fails ten more times]

Fix

1. Use option=value syntax in entrypoint.sh for passwords to ensure passwords starting with hyphens aren't parsed as a new option.

Testing

docker run --rm \
    -e NEXTCLOUD_ADMIN_USER=admin \
    -e NEXTCLOUD_ADMIN_PASSWORD="-starts-with-hyphen" \
    -e SQLITE_DATABASE="sqlite.db" \
    local/nextcloud:latest 

[...]
Starting nextcloud installation
Nextcloud was successfully installed
[...]

• I verified the same behavior and fix applies to database passwords (MYSQL_PASSWORD, POSTGRES_PASSWORD)

• Note: The same option=value pattern could also be applied to the other params for additional robustness. I'm happy to extend this PR if desired.