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

scripts/beta-version.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+import { createRequire } from "module";
+
+const require = createRequire(import.meta.url);
+const { latestBetaTag, nextBeta } = require("./beta-version.cjs");
+
+const TAGS = [
+  "v26.10.0",
+  "v26.11.0-beta.1",
+  "v26.11.0-beta.10",
+  "v26.11.0-beta.2",
+  "v26.11.0-beta.x",
+  "v26.12.0-beta.4",
+];
+
+describe("beta-version", () => {
+  it("numbers the next beta after the highest one, not the last listed", () => {
+    expect(nextBeta("26.11.0", TAGS)).toBe("26.11.0-beta.11");
+    expect(latestBetaTag("26.11.0", TAGS)).toBe("v26.11.0-beta.10");
+  });
+
+  it("starts at 1 for a version with no betas", () => {
+    expect(nextBeta("27.1.0", TAGS)).toBe("27.1.0-beta.1");
+    expect(latestBetaTag("27.1.0", TAGS)).toBe("");
+  });
+});