Fix some interpolation.

Author: johnbillion

docker-compose.yml

@@ -82,7 +82,7 @@ services:
     healthcheck:
       test: [
         'CMD-SHELL',
-        'if [ "${LOCAL_DB_IMAGE%%:*}" = "mariadb" ]; then case "${LOCAL_DB_IMAGE#*:}" in 5.5|10.0|10.1|10.2|10.3) mysqladmin ping -h localhost || exit $$?;; *) mariadb-admin ping -h localhost || exit $$?;; esac; else mysqladmin ping -h localhost || exit $$?; fi'
+        'if [ "$${LOCAL_DB_IMAGE%%:*}" = "mariadb" ]; then case "$${LOCAL_DB_IMAGE#*:}" in 5.5|10.0|10.1|10.2|10.3) mysqladmin ping -h localhost || exit $$?;; *) mariadb-admin ping -h localhost || exit $$?;; esac; else mysqladmin ping -h localhost || exit $$?; fi'
       ]
       timeout: 5s
       interval: 5s