feat: ported action definition from setup-terraform

Signed-off-by: Dmitry Kisler <admin@dkisler.com>

lib/releases.js

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) OpenTofu
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+class Build {
+  constructor (name, url) {
+    this.name = name;
+    this.url = url;
+  }
+}
+
+class Release {
+  constructor (releaseMeta) {
+    this.version = releaseMeta.tag_name.replace('v', '');
+    this.builds = releaseMeta.assets.map(asset => new Build(asset.name, asset.browser_download_url));
+  }
+
+  getBuild (platform, arch) {
+    const requiredName = `tofu_${this.version}_${platform}_${arch}.zip`;
+    return this.builds.find(build => build.name === requiredName);
+  }
+}
+
+/**
+ * Fetches the top 30 releases sorted in desc order.
+ *
+ */
+async function fetchReleases () {
+  const url = 'https://api.github.com/repos/opentofu/opentofu/releases';
+
+  const resp = await fetch(url, {
+    headers: {
+      Accept: 'application/vnd.github+json',
+      'X-GitHub-Api-Version': '2022-11-28'
+    }
+  });
+
+  if (!resp.ok) {
+    throw Error('failed fetching releases');
+  }
+
+  const releasesMeta = await resp.json();
+
+  return releasesMeta.map(releaseMeta => new Release(releaseMeta));
+}
+
+/**
+ * Fetches the release given the version.
+ *
+ * @param {string} version: Release version.
+ */
+async function getRelease (version) {
+  const releases = await fetchReleases();
+  return releases.find(release => release.version === version);
+}
+
+// Note that the export is defined as adaptor to replace hashicorp/js-releases
+// See: https://github.com/hashicorp/setup-terraform/blob/e192cfcbae6c6ed207c277ed7624131996c9bf13/lib/setup-terraform.js#L15
+module.exports = {
+  getRelease
+};