Rootless User konfigurierbar + Doku

Dockerfile

@@ -18,11 +18,15 @@ FROM mcr.microsoft.com/dotnet/aspnet:8.0
 # Build-Argument für Version (wird zur Build-Zeit vom CI/CD gesetzt)
 ARG VERSION=latest
 
+# Build-Argumente für UID/GID (Standard: 1000)
+ARG USER_UID=1000
+ARG USER_GID=1000
+
 # Install curl for health checks
 RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
 
-# Create non-root user
-RUN groupadd -r watcher -g 1000 && useradd -r -g watcher -u 1000 watcher
+# Create non-root user with configurable UID/GID
+RUN groupadd -r watcher -g ${USER_GID} && useradd -r -g watcher -u ${USER_UID} watcher
 
 WORKDIR /app
 COPY --from=build /app/publish .