🔱: [acme] sync upgrade with 4 commits [trident-sync]

Example for on-demand tls-alpn-01
Example disclaimer, fallback cert
Replace CircleCI with GitHub Actions

packages/core/acme-client/examples/api.js

@@ -4,7 +4,6 @@
 
 const acme = require('./../');
 
-
 function log(m) {
     process.stdout.write(`${m}\n`);
 }