Auto merge of #3382 - saethlin:sysroots-notification, r=saethlin

Fix sysroot notification list of broken targets

We use this same shell quoting trick on the line above to expand shell variables into the job URL. So this should work a line down as well... right?

src/tools/miri/.github/workflows/sysroots.yml

@@ -53,7 +53,7 @@ jobs:
           ~/.local/bin/zulip-send --user $ZULIP_BOT_EMAIL --api-key $ZULIP_API_TOKEN --site https://rust-lang.zulipchat.com \
             --stream miri --subject "Sysroot Build Errors ($(date -u +%Y-%m))" \
             --message 'It would appear that the [Miri sysroots cron job build]('"https://github.com/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID"') failed to build these targets:
-          $(ls failures)
+          '"$(ls failures)"'
 
           Would you mind investigating this issue?