use pattern matching instead of grep

Author: Guiorgy

pkg/docker/entrypoint.sh

@@ -109,7 +109,7 @@ if [[ ! -f /var/lib/pgadmin/pgadmin4.db && $external_config_db_exists == 'False'
     email_config="{'CHECK_EMAIL_DELIVERABILITY': ${CHECK_EMAIL_DELIVERABILITY}, 'ALLOW_SPECIAL_EMAIL_DOMAINS': ${ALLOW_SPECIAL_EMAIL_DOMAINS}, 'GLOBALLY_DELIVERABLE': ${GLOBALLY_DELIVERABLE}}"
     echo "email config is ${email_config}"
     is_valid_email=$(cd /pgadmin4/pgadmin/utils && /venv/bin/python3 -c "from validation_utils import validate_email; val = validate_email('${PGADMIN_DEFAULT_EMAIL}', ${email_config}); print(val)")
-    if echo "${is_valid_email}" | grep "False" &>/dev/null; then
+    if [[ $is_valid_email == *False* ]]; then
         echo "'${PGADMIN_DEFAULT_EMAIL}' does not appear to be a valid email address. Please reset the PGADMIN_DEFAULT_EMAIL environment variable and try again."
         echo "Validation output: ${is_valid_email}"
         exit 1