dev: add release flow

.github/workflows/tag.yml

@@ -0,0 +1,19 @@
+name: release
+on:
+  push:
+    tags:
+      - "[0-9]+.[0-9]+.[0-9]+"
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: "22"
+      - run: node tools/release.mjs
+        env:
+          GITHUB_TOKEN: ${{ github.token }}

tools/release.mjs

@@ -0,0 +1,33 @@
+import fs from "node:fs";
+import cp from "node:child_process";
+
+function praseRef(ref) {
+  const m = ref.match(/^refs\/tags\/(.+?)$/);
+  if (!m) throw new Error("no tags in ref: " + ref);
+  return m[1];
+}
+
+// GHAでGHPRにnpmリリースする
+async function main() {
+  let ref = process.env["GITHUB_REF"];
+  let token = process.env["GITHUB_TOKEN"];
+  if (!ref) throw new Error("no github ref");
+  if (!token) throw new Error("no github token");
+  const tag = praseRef(ref);
+  const packageJson = JSON.parse(await fs.promises.readFile("package.json"));
+  packageJson["version"] = tag;
+  await fs.promises.writeFile("package.json", JSON.stringify(packageJson));
+  const npmRc = "//npm.pkg.github.com/:_authToken=" + token;
+  await fs.promises.writeFile(".npmrc", npmRc);
+  const p = cp.spawn("npm", ["publish"]);
+  await new Promise((resolve, reject) => {
+    p.stderr.pipe(process.stderr);
+    p.stdout.pipe(process.stdout);
+    p.on("close", (code) => {
+      code === 0 ? resolve() : reject(code);
+    });
+  });
+  console.log(`📦 package ${tag} released!`);
+}
+
+main();