feat: make each plugin an npm workspace built by a termix-plugin CLI

packages/plugin-sdk/cli/commands/pack.mjs

@@ -0,0 +1,33 @@
+import fs from "node:fs";
+import path from "node:path";
+import { create } from "tar";
+import { readManifest } from "../lib/plugin-dir.mjs";
+
+/** Everything a server needs to run the plugin, and nothing else. D3 signs it. */
+const CONTENTS = [
+  "manifest.json",
+  "dist",
+  "locales",
+  "migrations",
+  "README.md",
+  "CHANGELOG.md",
+];
+
+export async function pack({ cwd }) {
+  const manifest = readManifest(cwd);
+  const pluginId = manifest.id ?? path.basename(cwd);
+  const version = manifest.version ?? "0.0.0";
+
+  if (!fs.existsSync(path.join(cwd, "dist", "backend.js"))) {
+    throw new Error(`${pluginId}: nothing built. Run termix-plugin build.`);
+  }
+
+  const files = CONTENTS.filter((entry) =>
+    fs.existsSync(path.join(cwd, entry)),
+  );
+  const outfile = path.join(cwd, `${pluginId}-${version}.tgz`);
+
+  await create({ gzip: true, cwd, file: outfile }, files);
+
+  console.log(`packed ${path.basename(outfile)}`);
+}