add dependency to bison

.gitlab-ci.yml

@@ -6,7 +6,7 @@ build-kernel:
   stage: build
   script:
     - apt-get update
-    - apt-get install -y build-essential curl flex
+    - apt-get install -y build-essential curl bison flex
     - cd kernel; ./compile.bash
   tags:
   - highmem