Add cmake to build container

.gitlab-ci.yml

@@ -42,6 +42,8 @@ test:
 # https://docs.gitlab.com/ee/user/project/releases/#use-a-generic-package-for-attaching-binaries
 build-linux:
   stage: build
+  before_script:
+    - apt update && apt install -y cmake
   script:
     - cargo build --release
   rules: