fix: modernize docker publishing

test/test_latest.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+node --input-type=module <<'NODE'
+import fs from 'node:fs';
+
+const readJson = (path) => JSON.parse(fs.readFileSync(path, 'utf8'));
+const checks = {
+  packageVersion: readJson('/app/package.json').version,
+  hasCli: fs.existsSync('/app/cli.js'),
+  hasIndex: fs.existsSync('/app/dist_ts/index.js'),
+  hasRendertronClass: fs.existsSync('/app/dist_ts/rendertron.classes.rendertron.js'),
+};
+
+if (checks.packageVersion !== '2.0.62') {
+  throw new Error(`Unexpected corerender package version ${checks.packageVersion}`);
+}
+if (!checks.hasCli) {
+  throw new Error('Missing cli.js');
+}
+if (!checks.hasIndex) {
+  throw new Error('Missing dist_ts/index.js');
+}
+if (!checks.hasRendertronClass) {
+  throw new Error('Missing rendertron class output');
+}
+
+console.log(JSON.stringify(checks));
+NODE