fixup! Need to pass command to bash, apparently

Apparently if you just use `$cmd`, it gets tokenized by spaces rather than
having quotes and backslashes and such interpreted as you might expect in
the shell. Since the mysql check commands are the first ones that have
spaces in the command, I need to change this to `bash -c "$cmd"`.
Apparently I had only tested the script with lms and such.

(The correct way to build up a command and run it is instead with arrays,
such as `"${cmd[@]}"`.)

check.sh

@@ -43,7 +43,7 @@ run_check() {
     local cmd="$3"
     echo "> $cmd"
     set +e  # Disable exit-on-error
-    if $cmd; then  # Run the command itself and check if it succeeded.
+    if bash -c "$cmd"; then  # Run the command itself and check if it succeeded.
         succeeded="$succeeded $check_name"
     else
         docker compose logs --tail 30 "$service"  # Just show recent logs, not all history