Update 00-config with correct formatting and variables

rootfs/etc/s6-overlay/cont-init.d/00-config

@@ -0,0 +1,18 @@
+#!/usr/bin/with-contenv bash
+CONFIG_PATH=/config
+mkdir -p "$CONFIG_PATH"
+if [ ! -f "$CONFIG_PATH/config.xml" ]; then
+    cat > "$CONFIG_PATH/config.xml" << EOC
+<config>
+  <user value="${USER:-Anonymous}"/>
+  <team value="${TEAM:-247478}"/>
+  <passkey value="${PASSKEY:-}"/>
+  <power value="${POWER:-medium}"/>
+  <web-enable value="true"/>
+  <http-addresses value="0.0.0.0:7396"/>
+  <account-token value="${ACCOUNT_TOKEN:-}"/>
+  <machine-id value="${MACHINE_NAME:-HomeAssistant}"/>
+</config>
+EOC
+    echo "Config created at $CONFIG_PATH/config.xml"
+fi