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: test
+
+# Controls when the action will run.
+on: push
+# 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:
+        neovim: [false, true]
+        version: ['nightly', 'stable']
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+    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: rhysd/action-setup-vim@v1
+        with:
+          neovim: ${{ matrix.neovim }}
+          version: ${{ matrix.version }}
+      - 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