Test: Switch from Travis to GitHub workflows (#2423)

.github/workflows/ci.yml

@@ -0,0 +1,18 @@
+name: ci
+
+on:
+    push:
+    pull_request:
+
+jobs:
+    linux_tests:
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v3
+              with:
+                  fetch-depth: 0
+                  persist-credentials: false
+
+            - name: Run tests
+              run: npm install

.travis.yml

@@ -1,12 +0,0 @@
-language: node_js
-node_js:
-  - 6
-
-sudo: false
-
-install:
-  - npm install
-
-cache:
-  directories:
-    - node_modules