Fix quoting of docker command

The version of bash in the build container doesn't like parens `(...)`
(usually meaning "run in a subshell"), so when I removed the
_evaluation_ `$(...)` in 9b56712 it decided not to run at all. On the
other hand, just removing the parens doesn't fix it: it needs double
quoting because it's being passed to docker.

run-release.sh

@@ -68,4 +68,4 @@ if [ -z "$NPM_TOKEN" ]; then
     exit 1
 fi
 echo '//registry.npmjs.org/:_authToken=${NPM_TOKEN}' > @jkcfg/std/.npmrc
-docker_run bash -c '(cd @jkcfg/std && npm publish)'
+docker_run bash -c "'cd @jkcfg/std && npm publish'"