feat: Implement basic sccache action support

Signed-off-by: Xuanwo <github@xuanwo.io>

src/sccache.ts

@@ -0,0 +1,68 @@
+import * as core from '@actions/core';
+import {downloadTool, extractTar, cacheDir} from '@actions/tool-cache';
+import {exec} from 'child_process';
+import * as fs from 'fs';
+import {promisify} from 'util';
+
+async function setup() {
+  // TODO:  we can support install latest version by default if version
+  // is not input.
+  const version = core.getInput('version');
+  console.log('try to setup for version: ', version);
+
+  const downloadUrl = `https://github.com/mozilla/sccache/releases/download/${version}/${getFilename}`;
+  console.log('try to setup from url: ', downloadUrl);
+
+  // Download and extract.
+  const sccachePackage = await downloadTool(downloadUrl);
+  const sccachePath = (await extractTar(sccachePackage)) + `/sccache`;
+
+  // Cache sccache.
+  const sccacheHome = await cacheDir(sccachePath, 'sccache', version);
+  // Add cached sccache into path.
+  core.addPath(`${sccacheHome}`);
+  // Expose the sccache path as env.
+  core.exportVariable('SCCACHE_PATH', `${sccacheHome}/sccache`);
+}
+
+function getFilename(version: string): Error | string {
+  return `sccache-${version}-${getArch()}-${getPlatform()}.${getExtension()}`;
+}
+
+function getArch(): Error | string {
+  switch (process.arch) {
+    case 'x64':
+      return 'x86_64';
+    case 'arm64':
+      return 'aarch64';
+    default:
+      return Error('not supported arch');
+  }
+}
+
+function getPlatform(): Error | string {
+  switch (process.platform) {
+    case 'darwin':
+      return 'apple-darwin';
+    case 'win32':
+      return 'pc-windows-msvc';
+    case 'linux':
+      return 'unknown-linux-musl';
+    default:
+      return Error('not supported platform');
+  }
+}
+
+function getExtension(): string {
+  switch (process.platform) {
+    case 'win32':
+      return 'zip';
+    default:
+      return 'tar.gz';
+  }
+}
+
+setup().catch(err => {
+  core.error(err);
+  core.setFailed(err.message);
+});