Use CONFIG_LOCATION only for migration

seafile/rootfs/etc/cont-init.d/00-migrate.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/with-contenv bashio
+# shellcheck shell=bash
+set -e
+
+slug=seafile
+legacy_path="/homeassistant/addons_config/$slug"
+target_path="/config"
+
+mkdir -p "$target_path"
+
+if bashio::config.has_value 'CONFIG_LOCATION' && [ "$(bashio::config 'CONFIG_LOCATION')" != "/config" ]; then
+    legacy_path="$(bashio::config 'CONFIG_LOCATION')"
+fi
+
+if [ -d "$legacy_path" ]; then
+    if [ ! -f "$legacy_path/.migrated" ] || [ -z "$(ls -A "$target_path" 2>/dev/null)" ]; then
+        echo "Migrating $legacy_path to $target_path"
+        cp -rnf "$legacy_path"/. "$target_path"/ || true
+        touch "$legacy_path/.migrated"
+    fi
+fi