Change: use uid/gid 10002 for postgres (#38)

Dockerfile

@@ -33,3 +33,12 @@ ENV PGDATAOLD /var/lib/postgresql/data
 ENV PGDATANEW /var/lib/postgresql/${POSTGRES_VERSION}/data
 
 COPY bin/upgradeversion.sh /usr/local/bin/upgradeversion
+
+# We decided to use our own UID range.
+# INFO: https://github.com/greenbone/automatix/blob/main/README.md
+# Change to user root user to run the commands.
+USER 0:0
+RUN groupmod -g 10002 postgres && usermod -u 10002 -g 10002 postgres && \
+  find / -uid 999 -not -path "/proc/*" -exec chown 10002 {} \; && \
+  find / -gid 999 -not -path "/proc/*" -exec chown :10002 {} \;
+USER 10002:10002