CI: FIXUP: Add curl for lsif

Signed-off-by: Taylor Smock <tsmock@fb.com>

.gitlab-ci.yml

@@ -66,6 +66,7 @@ assemble with java 15:
 code_navigation:
   stage: build
   script:
+    - apk add --update curl
     - curl -fLo coursier https://git.io/coursier-cli
     - chmod +x coursier \
     - ./coursier launch com.sourcegraph:lsif-java_2.13:0.4.0 -- index --build-tool gradle