auto install plugin, add various checks

root/etc/s6-overlay/s6-rc.d/svc-mod-nextcloud-notify-push-set-url/dependencies.d/svc-mod-nextcloud-notify-push

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+

root/etc/s6-overlay/s6-rc.d/svc-mod-nextcloud-notify-push-set-url/run

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+#!/usr/bin/with-contenv bash
+# shellcheck shell=bash
+
+NOTIFY_PUSH_URL=$(echo "$(occ config:system:get overwrite.cli.url)/push")
+echo "**** Setting notify_push server URL to ${NOTIFY_PUSH_URL} ****"
+if ! occ notify_push:setup "${NOTIFY_PUSH_URL}"; then
+    echo "**** There was an error setting the notify_push server URL. Please double check your reverse proxy settings as well as the overwrite.cli.url entry in Nextcloud's config.php ****"
+fi

root/etc/s6-overlay/s6-rc.d/svc-mod-nextcloud-notify-push-set-url/type

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+oneshot

root/etc/s6-overlay/s6-rc.d/svc-mod-nextcloud-notify-push-set-url/up

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+/etc/s6-overlay/s6-rc.d/svc-mod-nextcloud-notify-push-set-url/run