Implement logic to install specific cocoapods version

Author: Maxim Lobanov

.eslintrc.json

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+{
+    "env": {
+        "node": true,
+        "es6": true,
+        "jest/globals": true
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:jest/recommended"
+    ],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "project": "./tsconfig.eslint.json",
+        "ecmaVersion": 2018,
+        "sourceType": "module"
+    },
+    "plugins": ["@typescript-eslint", "jest"],
+    "ignorePatterns": ["node_modules/"],
+    "rules": {
+        "indent": ["error", 4],
+        "linebreak-style": ["error", "unix"],
+        "quotes": ["error", "double"],
+        "semi": ["error", "always"]
+    }
+}

.github/workflows/test.yml

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+name: Validate 'setup-cocoapods'
+on:
+  pull_request:
+  schedule:
+    - cron: 0 0 * * *
+
+jobs:
+  version-with-preinstalled:
+    name: valid version - replace preinstalled
+    runs-on: macos-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: setup-cocoapods
+      uses: ./
+      with:
+        version: 1.9.0
+
+    - name: Validate version
+      run: pod --version | grep "1.9.0"
+
+  version-without-preinstalled:
+    name: valid version - without preinstalled
+    runs-on: macos-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    
+    - name: Remove pre-installed version
+      run: gem uninstall cocoapods --all --executables
+
+    - name: setup-cocoapods
+      uses: ./
+      with:
+        version: 1.5.3
+
+    - name: Validate version
+      run: pod --version | grep "1.5.3"
+
+  version-latest:
+    name: latest version
+    runs-on: macos-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: setup-cocoapods
+      uses: ./
+      with:
+        version: latest

.gitignore

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+node_modules/
+lib

LICENSE

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+
+The MIT License (MIT)
+
+Copyright (c) 2020 Maxim Lobanov and contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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-# setup-cocoapods
-Set up your GitHub Actions workflow with a specific version of Cocoapods

action.yml

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+name: 'Setup Cocoapods'
+author: 'Maxim Lobanov'
+description: 'Set up your GitHub Actions workflow with a specific version of Cocoapods'
+inputs:
+  version:
+    description: 'Version of Cocoapods to install'
+    required: false
+  podfile-path:
+    description: 'Path to Podfile.lock file to determine cocoapods version'
+    required: false
+runs:
+  using: 'node12'
+  main: 'dist/index.js'
+branding:
+  icon: 'code'
+  color: 'yellow'