Add tests using themis on github actions

.github/workflows/test.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run.
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    strategy:
+      matrix:
+        vim_type: ['Vim'] # , 'Neovim']
+        version: ['head', 'stable']
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+        include:
+          - vim_type: 'Vim'
+            version: 'stable'
+            vim_version: 'v8.2.0000'
+    runs-on: '${{ matrix.os }}'
+    steps:
+      - uses: 'actions/checkout@v2'
+      - uses: 'actions/checkout@v2'
+        with:
+          repository: thinca/vim-themis
+          path: vim-themis
+      - name: 'Setup Vim'
+        id: 'vim'
+        uses: 'thinca/action-setup-vim@v1'
+        with:
+          vim_version: '${{ matrix.vim_version || matrix.version }}'
+          vim_type: '${{ matrix.vim_type }}'
+      - name: Write gh cli config file for test and check path
+        env:
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          import os
+          import subprocess
+          from os.path import expanduser
+
+          process = subprocess.Popen(["gh", "auth", "login", "--with-token"], stdin=subprocess.PIPE)
+          process.communicate(input=os.environ["TOKEN"].encode())
+          retcode = process.poll()
+          if retcode:
+            exit(1)
+
+          home = expanduser("~")
+          with open(os.path.join(home, ".config", "gh", "hosts.yml")) as cfg:
+            assert cfg.read()
+        shell: python
+      - name: Run unit tests with themis.vim
+        env:
+          THEMIS_VIM: ${{ steps.vim.outputs.executable }}
+        run: ./vim-themis/bin/themis -r

test/gh/gh.vim

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+let s:suite = themis#suite('gh')
+let s:assert = themis#helper('assert')
+
+function! s:suite.test_get_gh_token()
+  let gh_token = gh#gh#get_token()
+  call s:assert.false(empty(gh_token))
+endfunction