Fix interpolation error.

Author: desrosj

docker-compose.yml

@@ -82,7 +82,7 @@ services:
     command: ${LOCAL_DB_AUTH_OPTION-}
 
     healthcheck:
-      test: [ "CMD-SHELL", "if [ \"$LOCAL_DB_TYPE\" = \"mariadb\" ]; then case \"$LOCAL_DB_VERSION\" 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 $?; fi" ]
+      test: [ "CMD-SHELL", "if [ \"$LOCAL_DB_TYPE\" = \"mariadb\" ]; then case \"$LOCAL_DB_VERSION\" 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
       retries: 10