Refactor Dockerfile to create appuser with home directory and set permissions

Dockerfile

@@ -15,15 +15,9 @@ FROM python:${PYTHON_VERSION}-slim as base
 # the application crashes without emitting any logs due to buffering.
 ENV PYTHONUNBUFFERED=1
 
-ARG UID=10001
-RUN adduser \
-    --disabled-password \
-    --gecos "" \
-    --home "/nonexistent" \
-    --shell "/sbin/nologin" \
-    --no-create-home \
-    --uid "${UID}" \
-    appuser
+RUN useradd -m -s /bin/bash appuser && \
+    # Give necessary permissions
+    chown -R appuser:appuser /app
 
 USER appuser