feat: migrate to GitHub Actions from Travis

.github/workflows/ci.yaml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: lts/*
+
+      - run: |
+          yarn
+          yarn test
+
+      - run: yarn prod:start
+        if: ${{ github.ref == 'refs/heads/master' && github.event_name == 'push' }}

.mergify.yml

@@ -1,15 +1,15 @@
 pull_request_rules:
   - name: Automatic merge on approval
     conditions:
-      - "#approved-reviews-by>=1"
-      - check-success=Travis CI - Branch
+      - '#approved-reviews-by>=1'
+      - check-success=build-and-test
     actions:
       merge:
         method: merge
   - name: automatic merge for Dependabot pull requests
     conditions:
       - author~=^dependabot(|-preview)\[bot\]$
-      - check-success=Travis CI - Branch
+      - check-success=build-and-test
     actions:
       merge:
         method: merge