ROX-19980 fix

Author: ludydoo

image/db/rhel/Dockerfile.slim

@@ -36,7 +36,7 @@ RUN curl -sSLf https://download.postgresql.org/pub/repos/yum/RPM-GPG-KEY-PGDG-${
     groupadd -g 70 postgres && \
     adduser postgres -u 70 -g 70 -d /var/lib/postgresql -s /bin/sh && \
     microdnf install \
-        ca-certificates libicu systemd-sysv glibc-locale-source glibc-langpack-en \
+        ca-certificates tar libicu systemd-sysv glibc-locale-source glibc-langpack-en \
         postgresql12-server && \
     # The removal of /usr/share/zoneinfo from UBI minimal images is intentional.
     # After building the image, the image is reduced in size as much as possible,

image/db/rhel/scripts/custom-entrypoint.sh

@@ -38,7 +38,11 @@ if [ ! -d "/var/lib/postgresql/data/pgdata" ]; then
   echo "Renaming postgres user if necessary..."
   if [ -n "$POSTGRES_USER" ]; then
     if [ "$POSTGRES_USER" != "postgres" ]; then
-      PGPASSWORD="$POSTGRES_PASSWORD" psql -c "ALTER USER postgres RENAME TO $POSTGRES_USER;"
+      if [ -n "$POSTGRES_PASSWORD" ]; then
+        PGPASSWORD="$POSTGRES_PASSWORD" psql -c "ALTER USER postgres RENAME TO $POSTGRES_USER;"
+      elif [ -n "$POSTGRES_PASSWORD_FILE" ]; then
+        PGPASSWORD="$(cat "$POSTGRES_PASSWORD_FILE")" psql -c "ALTER USER postgres RENAME TO $POSTGRES_USER;"
+      fi
     fi
   fi