fix: user management in Docker container startup

Dockerfile

@@ -10,14 +10,14 @@ COPY ./nginx.conf /etc/nginx/nginx.conf
 
 WORKDIR /yamtrack
 
-RUN apk add --no-cache nginx \
+RUN apk add --no-cache nginx shadow \
     && pip install --no-cache-dir -r /requirements.txt \
     && pip install --no-cache-dir supervisor==4.2.5 \
     && rm -rf /root/.cache /tmp/* \
     && find /usr/local -type d -name __pycache__ -exec rm -rf {} + \
     && chmod +x /entrypoint.sh \
     # create user abc for later PUID/PGID mapping
-    && adduser -D -H -s /bin/sh abc \
+    && useradd -U -M -s /bin/sh abc \
     # Create required nginx directories and set permissions
     && mkdir -p /var/log/nginx \
     && mkdir -p /var/lib/nginx/body \

entrypoint.sh

@@ -7,12 +7,8 @@ python manage.py migrate --noinput
 PUID=${PUID:-1000}
 PGID=${PGID:-1000}
 
-if [ "$(id -u abc)" != "$PUID" ] || [ "$(id -g abc)" != "$PGID" ]; then
-    # Delete and recreate the user with the correct IDs
-    deluser abc
-    addgroup -g "$PGID" abc
-    adduser -D -H -G abc -s /bin/sh -u "$PUID" abc
-fi
+groupmod -o -g "$PGID" abc
+usermod -o -u "$PUID" abc
 
 chown -R abc:abc /yamtrack
 chown -R abc:abc db