refactor: reduce deployment to one compose file

Dockerfile

@@ -15,7 +15,7 @@ FROM alpine:3.23.2 AS runtime
 RUN apk add --no-cache ca-certificates && \
     addgroup -S -g 10001 dyndns && \
     adduser -S -D -H -u 10001 -G dyndns dyndns && \
-    mkdir -p /data && chown dyndns:dyndns /data
+    mkdir -p /data /secrets && chown dyndns:dyndns /data /secrets
 
 COPY --from=build /out/dyndns-web /usr/local/bin/dyndns-web