setup-go: Action cannot be used with Self hosted runner

Intro

Type of issue: Bug report

Reproduce

1. On a clean linux machine (I tested on Ubuntu20.04, Ubuntu18.04 and Debian10).
2. Following the instruction in https://docs.github.com/en/actions/hosting-your-own-runners/configuring-the-self-hosted-runner-application-as-a-service, to create a self-hosted runner
3. Registrate it to your GitHub Account’s runner
4. Create a sample repo which has access to that self-hosted runner
5. Create a GitHub config file

jobs:
  gotest:
    name: GoTest
    runs-on: [self-hosted, linux]
    steps:
      - uses: AutoModality/action-clean@v1
      - name: Checkout
      - uses: actions/setup-go@v2
        with:
          go-version: '1.14.*'
      - name: Go Env
        run: |
          go env

1. Get this error in actions/setup-go@v2, but it won’t exit the pipeline.

(node:12435) UnhandledPromiseRejectionWarning: AssertionError [ERR_ASSERTION]: a path argument must be provided
    at Object.<anonymous> (/github-action-runner/_work/_actions/actions/setup-go/v2/dist/index.js:4752:18)
    at Generator.next (<anonymous>)
    at /github-action-runner/_work/_actions/actions/setup-go/v2/dist/index.js:4692:71
    at new Promise (<anonymous>)
    at module.exports.672.__awaiter (/github-action-runner/_work/_actions/actions/setup-go/v2/dist/index.js:4688:12)
    at Object.mkdirP (/github-action-runner/_work/_actions/actions/setup-go/v2/dist/index.js:4751:12)
    at Object.<anonymous> (/github-action-runner/_work/_actions/actions/setup-go/v2/dist/index.js:204:22)
    at Generator.next (<anonymous>)
    at /github-action-runner/_work/_actions/actions/setup-go/v2/dist/index.js:57:71
    at new Promise (<anonymous>)

1. This is a non stopping error, so in go env line, another error will occur.

build cache is required, but could not be located: GOCACHE is not defined and neither $XDG_CACHE_HOME nor $HOME are defined

1. Check the go env and you can find that GOPATH, GOENV are missing.

Possible bugs

1. As the $HOME is not correctly exported and GOCACHE is "off", go cannot run.
2. Besides, another possible problem may be in this part and thus get a a path argument must be provided error. https://github.com/actions/setup-go/blob/3b4dc6cbed1779f759b9c638cb83696acea809d1/src/main.ts#L67-L73