Update Dockerfile

Dockerfile

@@ -4,10 +4,10 @@ ENV TELEGRAM_API_ID=$TELEGRAM_API_ID
 ENV TELEGRAM_API_HASH=$TELEGRAM_API_HASH
 ENV TELEGRAM_LOCAL=true
 
-RUN apk add --no-cache openssh-client
+RUN apk add --no-cache openssh-client shadow
 
-RUN groupadd -r appgroup && \
-    useradd -r -g appgroup -m -s /bin/sh appuser
+RUN addgroup -S appgroup && \
+    adduser -S -G appgroup -h /home/appuser -s /bin/sh appuser
 
 RUN mkdir -p /app
 WORKDIR /app