Change GitHub CI code

Author: flip111

.github/workflows/ci.yml

@@ -22,14 +22,13 @@ jobs:
 
       - name: Install dependencies
         run: |
-          npm install -g bower
+          npm install -g spago
           npm install
-          bower install --production
+          spago fetch
 
       - name: Build source
-        run: npm run-script build
+        run: spago build
 
       - name: Run tests
         run: |
-          bower install
-          npm run-script test --if-present
+          spago test