[CI] Move npm jobs from Travis to Github Actions

.github/workflows/assets_code_analysis.yaml

@@ -0,0 +1,39 @@
+name: Assets Code Analysis
+
+on:
+    pull_request: null
+    push:
+        branches:
+            - master
+
+jobs:
+    asses_code_analysis:
+        strategy:
+            fail-fast: false
+            matrix:
+                actions:
+                    -
+                        name: Lint Javascript files
+                        run: npm run lint
+
+                    -
+                        name: Lint on SCSS files
+                        run: npm run stylelint
+
+        name: ${{ matrix.actions.name }}
+        runs-on: ubuntu-latest
+
+        steps:
+            -   uses: actions/checkout@v2
+
+            # see https://github.com/actions/starter-workflows/blob/main/ci/node.js.yml
+            -
+                name: Use Node.js 12.5
+                uses: actions/setup-node@v1
+                with:
+                    node-version: 12.5
+
+            # same as "npm install", just uses package-lock.json", see https://stackoverflow.com/a/53325242/1348344
+            -   run: npm ci
+
+            -   run: ${{ matrix.actions.run }}

.travis.yml

@@ -42,12 +42,6 @@ before_script:
   - export PATH=$PATH:$PWD/vendor/bin
 
 script:
-  # run EsLint on Javascript files
-  - npm run lint
-
-  # run StyleLint on SCSS
-  - npm run stylelint
-
   # run PHP Unit
   - ./vendor/bin/phpunit