feat: beta channels for core and plugins with one stable/beta release workflow

scripts/beta-version.cjs

@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+/**
+ * Works out beta numbers from a list of tags on stdin.
+ *
+ * node scripts/beta-version.cjs 26.11.0 < tags.txt          -> 26.11.0-beta.3
+ * node scripts/beta-version.cjs 26.11.0 --latest < tags.txt -> v26.11.0-beta.2
+ */
+
+const fs = require("fs");
+
+function betaNumbers(base, tags) {
+  const prefix = `v${base}-beta.`;
+  return tags
+    .map((tag) => tag.trim())
+    .filter((tag) => tag.startsWith(prefix))
+    .map((tag) => Number(tag.slice(prefix.length)))
+    .filter((n) => Number.isInteger(n) && n > 0)
+    .sort((a, b) => a - b);
+}
+
+function nextBeta(base, tags) {
+  const numbers = betaNumbers(base, tags);
+  return `${base}-beta.${(numbers.at(-1) ?? 0) + 1}`;
+}
+
+function latestBetaTag(base, tags) {
+  const numbers = betaNumbers(base, tags);
+  return numbers.length ? `v${base}-beta.${numbers.at(-1)}` : "";
+}
+
+if (require.main === module) {
+  const base = process.argv[2];
+  if (!base || !/^\d+\.\d+\.\d+$/.test(base)) {
+    console.error("beta-version: pass a version like 26.11.0");
+    process.exit(1);
+  }
+  const tags = fs.readFileSync(0, "utf8").split("\n");
+  console.log(
+    process.argv.includes("--latest")
+      ? latestBetaTag(base, tags)
+      : nextBeta(base, tags),
+  );
+}
+
+module.exports = { latestBetaTag, nextBeta };