fix: pre-create /config/data at build time and set AURRAL_DATA_DIR as ENV

aurral/Dockerfile

@@ -15,7 +15,13 @@ LABEL \
     io.hass.version="${BUILD_VERSION}" \
     maintainer="petruknw"
 
+# Set data dir via Docker ENV so it's available before any shell script runs.
+# /config is HA's addon_config mount point (always writable).
+ENV AURRAL_DATA_DIR=/config/data
+
 COPY rootfs /
 
 RUN chmod a+x /etc/services.d/aurral/run \
-    && chmod a+x /usr/local/bin/docker-entrypoint.sh
+    && chmod a+x /usr/local/bin/docker-entrypoint.sh \
+    # Pre-create the data dir so the entrypoint chown succeeds at startup
+    && mkdir -p /config/data