add config logging

[rsalmond]

Partial fix for #52

I needed this while debugging something. This logs what config is being used, but not where it comes from. It also doesn't log any output until somebody hits a wordpress URL and application.php gets loaded.

But this is maybe enough to get us started debugging things?

[25-Aug-2026 19:12:07 UTC] === CURRENT CONFIGURATION ===
[25-Aug-2026 19:12:07 UTC] Array
(
    [ABSPATH] => /app/web/wp/
    [WP_ENV] => stage
    [WP_HOME] => https://canopy.gpogear.ca
    [WP_SITEURL] => https://canopy.gpogear.ca/wp
    [CONTENT_DIR] => /app
    [WP_CONTENT_DIR] => /app/web/app
    [WP_CONTENT_URL] => https://canopy.gpogear.ca/app
    [DB_NAME] => canopy
    [DB_USER] => canopy
    [DB_PASSWORD] => [REDACTED: 24 chars]
    [DB_HOST] => 10.56.0.3
    [DB_CHARSET] => utf8mb4
    [DB_COLLATE] =>
    [AUTH_KEY] => [REDACTED]
    [SECURE_AUTH_KEY] => [REDACTED]
    [LOGGED_IN_KEY] => [REDACTED]
    [NONCE_KEY] => [REDACTED]
    [AUTH_SALT] => [REDACTED]
    [SECURE_AUTH_SALT] => [REDACTED]
    [LOGGED_IN_SALT] => [REDACTED]
    [NONCE_SALT] => [REDACTED]
    [AUTOMATIC_UPDATER_DISABLED] => 1
    [DISABLE_WP_CRON] =>
    [DISALLOW_FILE_EDIT] => 1
    [DISALLOW_FILE_MODS] => 1
    [WP_POST_REVISIONS] => 1
    [CONCATENATE_SCRIPTS] =>
    [WP_DEBUG_DISPLAY] =>
    [WP_DEBUG_LOG] => /dev/stderr
    [SCRIPT_DEBUG] =>
)
[25-Aug-2026 19:12:07 UTC] =============================