add CI workflow

Author: rhysd

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  unit-tests:
+    name: Unit tests
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - run: sudo apt install -y --no-install-recommends clang-format
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3
+          bundler-cache: true
+      - uses: rhysd/action-setup-vim@v1
+      - name: Run unit tests
+        run: |
+          cd ./test
+          bundle --version
+          bundle install
+          bundle exec vim-flavor test

test/Gemfile.lock

@@ -1,17 +1,17 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    parslet (1.8.1)
-    thor (0.20.0)
+    parslet (1.8.2)
+    thor (0.20.3)
     vim-flavor (1.1.5)
       parslet (~> 1.0)
       thor (~> 0.14)
 
 PLATFORMS
-  ruby
+  x86_64-darwin-19
 
 DEPENDENCIES
   vim-flavor (~> 1.1)
 
 BUNDLED WITH
-   1.11.2
+   2.2.22