Apply Olaf suggestions to lsif pipeline (#352)

* Apply Olaf suggestions to lsif pipeline

* Add missing coursier setup-action

Author: ghostbuster91

.github/workflows/main.yaml

@@ -15,15 +15,16 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: coursier/[email protected]
-      - uses: olafurpg/setup-scala@v13
+      - uses: coursier/setup-[email protected]
         with:
-          java-version: [email protected]
+          jvm: adopt:11
+          apps: lsif-java
       - name: Run tests with sbt
         run: sbt test
       - name: Compile docs
         run: sbt compileDocs
       - name: Generate LSIF
-        run: curl -fLo coursier https://git.io/coursier-cli && chmod +x coursier && ./coursier launch com.sourcegraph:lsif-java_2.13:0.7.3 -- index
+        run: lsif-java index 
       - name: Upload LSIF data
         uses: sourcegraph/lsif-upload-action@master
         with: