fix: restart credentials devserver in its provisioning script

It seems that Credentials' devserver doesn't get restarted by
the commands in its provisioning script. This has been resulting
in it silently failing healthchecks in the provisioning test
GitHub action workflow, with the devserver reporting
missing requirements.

The cause of the failure passing silently is addressed in an
adjecent commit.

Author: kdmccormick

provision-credentials.sh

@@ -30,3 +30,6 @@ docker-compose exec -T ${name} bash -e -c 'source /edx/app/credentials/credentia
 # started if they do not care about static assets
 echo -e "${GREEN}Compiling static assets for ${name}...${NC}"
 docker-compose exec -T ${name}  bash -e -c ' if ! source /edx/app/credentials/credentials_env && cd /edx/app/credentials/credentials && make static 2>creds_make_static.err; then echo "------- Last 100 lines of stderr"; tail creds_make_static.err -n 100; echo "-------"; fi;' -- "$name"
+
+# Restart credentials devserver.
+make dev.restart-devserver.credentials