Change grep regex in the docker's entrypoint to find env variables starting with PGADMIN_CONFIG_ only.

pkg/docker/entrypoint.sh

@@ -31,7 +31,7 @@ EOF
 
     # This is a bit kludgy, but necessary as the container uses BusyBox/ash as
     # it's shell and not bash which would allow a much cleaner implementation
-    for var in $(env | grep PGADMIN_CONFIG_ | cut -d "=" -f 1); do
+    for var in $(env | grep "^PGADMIN_CONFIG_" | cut -d "=" -f 1); do
         # shellcheck disable=SC2086
         # shellcheck disable=SC2046
         echo ${var#PGADMIN_CONFIG_} = $(eval "echo \$$var") >> /pgadmin4/config_distro.py