Used alpine as a based image

Dockerfile.pg13

@@ -1,4 +1,4 @@
-FROM python:3.10-slim-bullseye
+FROM alpine:3.16
 
 ENV HOME=/home/app \
     APP_HOME=/home/app/docker-postgres-backup \
@@ -18,15 +18,13 @@ ENV HOME=/home/app \
     LANGUAGE=en_US:en \
     LC_ALL=en_US.UTF-8
 
-RUN apt-get update && apt-get install -y --no-install-recommends locales postgresql-client-13 tini && \
-    apt-get -y --purge autoremove && apt-get clean && rm -rf /var/cache/apt && \
-    sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen && pip install -U pip
+RUN apk --no-cache add postgresql13-client python3 py3-pip tini
 
 COPY ./ $APP_HOME
 WORKDIR $APP_HOME
 
-RUN python -m pip install $APP_HOME
+RUN python3 -m pip install $APP_HOME
 
 ENTRYPOINT ["tini", "--"]
 
-CMD ["python", "start.py"]
+CMD ["python3", "start.py"]