🦺 Check Ruby runtime

[ShiriNmi1520]

Description

This PR adds Ruby runtime validation before running Ruby command.

Why this PR exists

I've encountered a weird EINVALIDGEMSPEC error when releasing my modification to RubyGem.
After struggling for half an hour, I discovered I was missing install Ruby in my CircleCI script; after adding them, the error disappeared.
This PR can add some clarity to error messages.

Fixed CircleCi configuration

jobs:
  release:
    executor: node/default
    steps:
      - checkout
      - check-changed-files-or-halt:
          pattern: ^(lib)|(.rb|gemspec)$
      # This ruby/install step was missing
      - ruby/install:
          version: 3.0.0
      - run: yarn install --frozen-lockfile
      - run: yarn semantic-release

Semantic release configuration

{
  "release": {
    "branches": ["master"]
  },
  "plugins": [
    "@semantic-release/commit-analyzer",
    "semantic-release-gitmoji",
    "@semantic-release/release-notes-generator",
    [
      "@webhippie/semantic-release-rubygem",
      {
        "gemPublish": true,
        "versionGlob": "lib/fastlane/plugin/google_cloud_storage/version.rb"
      }
    ]
  ]
}

Origin error before adding Ruby runtime

yarn run v1.22.22
$ /home/circleci/project/node_modules/.bin/semantic-release
[2:11:37 AM] [semantic-release] › ℹ  Running semantic-release version 24.2.0
[2:11:37 AM] [semantic-release] › ✔  Loaded plugin "verifyConditions" from "@webhippie/semantic-release-rubygem"
[2:11:37 AM] [semantic-release] › ✔  Loaded plugin "analyzeCommits" from "@semantic-release/commit-analyzer"
[2:11:37 AM] [semantic-release] › ✔  Loaded plugin "analyzeCommits" from "semantic-release-gitmoji"
[2:11:37 AM] [semantic-release] › ✔  Loaded plugin "generateNotes" from "semantic-release-gitmoji"
[2:11:37 AM] [semantic-release] › ✔  Loaded plugin "generateNotes" from "@semantic-release/release-notes-generator"
[2:11:37 AM] [semantic-release] › ✔  Loaded plugin "prepare" from "@webhippie/semantic-release-rubygem"
[2:11:37 AM] [semantic-release] › ✔  Loaded plugin "publish" from "@webhippie/semantic-release-rubygem"
[2:11:37 AM] [semantic-release] › ✔  Run automated release from branch master on repository [email protected]:ShiriNmi1520/my-gem.git
[2:11:38 AM] [semantic-release] › ✔  Allowed to push to the Git repository
[2:11:38 AM] [semantic-release] › ℹ  Start step "verifyConditions" of plugin "@webhippie/semantic-release-rubygem"
[2:11:38 AM] [semantic-release] › ✘  Failed step "verifyConditions" of plugin "@webhippie/semantic-release-rubygem"
[2:11:38 AM] [semantic-release] › ✘  EINVALIDGEMSPEC Error loading `my-gem.gemspec`
A valid .gemspec (https://guides.rubygems.org/specification-reference/) is required to release a Rubygem.

Please follow the "Make your own gem guide (https://guides.rubygems.org/make-your-own-gem/)" to create a valid .gemspec file
      

AggregateError: 
    SemanticReleaseError: Error loading `my-gem.gemspec`
        at loadGemspec (file:///home/circleci/project/node_modules/@webhippie/semantic-release-rubygem/lib/verify.js:37:11)
        at async verify (file:///home/circleci/project/node_modules/@webhippie/semantic-release-rubygem/lib/verify.js:122:29)
        at async verifyConditions (file:///home/circleci/project/node_modules/@webhippie/semantic-release-rubygem/index.js:17:40)
        at async validator (file:///home/circleci/project/node_modules/semantic-release/lib/plugins/normalize.js:36:24)
        at async file:///home/circleci/project/node_modules/semantic-release/lib/plugins/pipeline.js:38:36
        at async file:///home/circleci/project/node_modules/semantic-release/lib/plugins/pipeline.js:32:5
        at async pluginsConfigAccumulator.<computed> [as verifyConditions] (file:///home/circleci/project/node_modules/semantic-release/lib/plugins/index.js:87:11)
        at async run (file:///home/circleci/project/node_modules/semantic-release/index.js:106:3)
        at async Module.default (file:///home/circleci/project/node_modules/semantic-release/index.js:278:22)
    at file:///home/circleci/project/node_modules/semantic-release/lib/plugins/pipeline.js:55:13
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async pluginsConfigAccumulator.<computed> [as verifyConditions] (file:///home/circleci/project/node_modules/semantic-release/lib/plugins/index.js:87:11)
    at async run (file:///home/circleci/project/node_modules/semantic-release/index.js:106:3)
    at async Module.default (file:///home/circleci/project/node_modules/semantic-release/index.js:278:22)
    at async default (file:///home/circleci/project/node_modules/semantic-release/cli.js:55:5) {
  errors: [
    SemanticReleaseError: Error loading `my-gem.gemspec`
        at loadGemspec (file:///home/circleci/project/node_modules/@webhippie/semantic-release-rubygem/lib/verify.js:37:11)
        at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
        at async verify (file:///home/circleci/project/node_modules/@webhippie/semantic-release-rubygem/lib/verify.js:122:29)
        at async verifyConditions (file:///home/circleci/project/node_modules/@webhippie/semantic-release-rubygem/index.js:17:40)
        at async validator (file:///home/circleci/project/node_modules/semantic-release/lib/plugins/normalize.js:36:24)
        at async file:///home/circleci/project/node_modules/semantic-release/lib/plugins/pipeline.js:38:36
        at async file:///home/circleci/project/node_modules/semantic-release/lib/plugins/pipeline.js:32:5
        at async pluginsConfigAccumulator.<computed> [as verifyConditions] (file:///home/circleci/project/node_modules/semantic-release/lib/plugins/index.js:87:11)
        at async run (file:///home/circleci/project/node_modules/semantic-release/index.js:106:3)
        at async Module.default (file:///home/circleci/project/node_modules/semantic-release/index.js:278:22) {
      code: 'EINVALIDGEMSPEC',
      details: 'A valid [.gemspec](https://guides.rubygems.org/specification-reference/) is required to release a Rubygem.\n' +
        '\n' +
        'Please follow the "[Make your own gem guide](https://guides.rubygems.org/make-your-own-gem/)" to create a valid `.gemspec` file\n' +
        '      ',
      semanticRelease: true,
      pluginName: '@webhippie/semantic-release-rubygem'
    }
  ]
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Exited with code exit status 1

[ShiriNmi1520]

Reopen for resolved conflicts