Update scala.yml

Define the environment variable required for build.
Fix the test.

Author: XenonAbe

.github/workflows/scala.yml

@@ -7,11 +7,13 @@ jobs:
 
     runs-on: ubuntu-latest
 
+    env:
+      GITHUB_TOKEN: DUMMY
     steps:
     - uses: actions/checkout@v1
     - name: Set up JDK 1.8
       uses: actions/setup-java@v1
       with:
         java-version: 1.8
     - name: Run tests
-      run: sbt test
+      run: sbt scripted