Update Dockerfile

Dockerfile

@@ -19,8 +19,9 @@ RUN python3 -m venv /app/venv && \
 COPY app.py /app/app.py
 COPY torrc /etc/tor/torrc
 
-# Create tor user and group explicitly, set permissions
-RUN addgroup -S tor && adduser -S -G tor tor && \
+# Ensure tor user and group exist, set permissions
+RUN if ! getent group tor >/dev/null; then addgroup -S tor; fi && \
+    if ! getent passwd tor >/dev/null; then adduser -S -G tor tor; fi && \
     mkdir -p /var/lib/tor && \
     chown -R tor:tor /etc/tor /var/lib/tor