reimplement github action in typescript

src/install.ts

@@ -0,0 +1,27 @@
+import * as core from "@actions/core"
+import * as tc from "@actions/tool-cache"
+import path from "path"
+import { run as setupGo } from "setup-go/lib/main"
+
+import { stringifyVersion, Version } from "./version"
+
+// The installLint returns path to installed binary of golangci-lint.
+export async function installLint(ver: Version): Promise<string> {
+  core.info(`Installing golangci-lint ${stringifyVersion(ver)}...`)
+  const startedAt = Date.now()
+  const dirName = `golangci-lint-${ver.major}.${ver.minor}.${ver.patch}-linux-amd64`
+  const assetUrl = `https://github.com/golangci/golangci-lint/releases/download/${stringifyVersion(ver)}/${dirName}.tar.gz`
+
+  const tarGzPath = await tc.downloadTool(assetUrl)
+  const extractedDir = await tc.extractTar(tarGzPath, process.env.HOME)
+  const lintPath = path.join(extractedDir, dirName, `golangci-lint`)
+  core.info(`Installed golangci-lint into ${lintPath} in ${Date.now() - startedAt}ms`)
+  return lintPath
+}
+
+export async function installGo(): Promise<void> {
+  const startedAt = Date.now()
+  process.env[`INPUT_GO-VERSION`] = `1`
+  await setupGo()
+  core.info(`Installed Go in ${Date.now() - startedAt}ms`)
+}