Github automation.

.github/workflows/test.yml

@@ -0,0 +1,32 @@
+name: Run tests
+
+on: [pull_request, push]
+
+jobs:
+  unit_tests:
+    name: Run unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v2
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+
+      - name: Restore gems from cache
+        uses: actions/cache@v2
+        env:
+          cache-name: ruby-gems-cache
+        with:
+          path: ./.gems
+          key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/dbml.gemspec') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ env.cache-name }}-
+
+      - name: Install gems
+        run: bundle install --path=./.gems --jobs=4 
+
+      - name: Run tests
+        run: bundle exec rake test