Add support for rc and beta versions in go.mod file

The regex in `parseGoVersionFile()` didn't consider rc and beta
versions. The regex has been extended.

In `findMatch()` the match is checked using `semver.satisfies()`. But
`semver.satisfies()` doesn't no about Go's non-semver rc and beta
version formats (1.16c1 instead of 1.16.0-rc.1).

We cannot use `makeSemver()` on `versionSpec` and compare the result
using `semver.satisfies()` because `versionSpec` could be, well, a
spec. Instead we first check if there is a strict match between the
candidate version and the versionSpec.

Fixes #525.

__tests__/setup-go.test.ts

@@ -1,22 +1,22 @@
 import {
-  jest,
-  describe,
-  it,
-  expect,
-  beforeAll,
-  beforeEach,
-  afterEach,
-  afterAll
+    afterAll,
+    afterEach,
+    beforeAll,
+    beforeEach,
+    describe,
+    expect,
+    it,
+    jest
 } from '@jest/globals';
-import fs from 'fs';
 import cp from 'child_process';
+import fs from 'fs';
 
-import goJsonData from './data/golang-dl.json' with {type: 'json'};
-import matchers from '../matchers.json' with {type: 'json'};
-import goTestManifest from './data/versions-manifest.json' with {type: 'json'};
+import matchers from '../matchers.json' with { type: 'json' };
+import goJsonData from './data/golang-dl.json' with { type: 'json' };
+import goTestManifest from './data/versions-manifest.json' with { type: 'json' };
 
-import type {IGoVersion} from '../src/installer.js';
-import type {IToolRelease} from '@actions/tool-cache';
+import type { IToolRelease } from '@actions/tool-cache';
+import type { IGoVersion } from '../src/installer.js';
 
 const httpClientGetJson = jest.fn();
 
@@ -336,11 +336,11 @@ describe('setup-go', () => {
     expect(fileName).toBe('go1.13.7.windows-386.zip');
   });
 
-  it('finds unstable pre-release version', async () => {
+  it('finds unstable release candidate', async () => {
     os.platform = 'linux';
     os.arch = 'x64';
 
-    // spec: 1.14, stable=false => go1.14rc1
+    // spec: 1.14.0-rc.1, stable=false => go1.14rc1
     const match: IGoVersion | undefined = await im.findMatch('1.14.0-rc.1');
     expect(match).toBeDefined();
     const version: string = match ? match.version : '';
@@ -349,6 +349,47 @@ describe('setup-go', () => {
     expect(fileName).toBe('go1.14rc1.linux-amd64.tar.gz');
   });
 
+  it('finds unstable beta version', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.18.0-beta.2, stable=false => go1.18beta2
+    const match: im.IGoVersion | undefined = await im.findMatch(
+      '1.18.0-beta.2'
+    );
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.18beta2');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.18beta2.linux-amd64.tar.gz');
+  });
+
+  it('finds unstable release candidate (go version format)', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.14rc1, stable=false => go1.14rc1
+    const match: im.IGoVersion | undefined = await im.findMatch('1.14rc1');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.14rc1');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.14rc1.linux-amd64.tar.gz');
+  });
+
+  it('finds unstable beta version (go version format)', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.18beta2, stable=false => go1.18beta2
+    const match: im.IGoVersion | undefined = await im.findMatch('1.18beta2');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.18beta2');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.18beta2.linux-amd64.tar.gz');
+  });
+
   it('evaluates to stable with input as true', async () => {
     inputs['go-version'] = '1.13.0';
     inputs.stable = 'true';