ci: nuke the gitlab caches (#9855)

Will go without cache. Meanwhile have to investigate what was wrong and how to use it effectively.

Author: 5chdn

.gitlab-ci.yml

@@ -11,12 +11,6 @@ variables:
   CARGO_HOME:                      "${CI_PROJECT_DIR}/.cargo"
   CARGO_TARGET:                    x86_64-unknown-linux-gnu
 
-cache:
-  key:                             "${CI_JOB_NAME}"
-  paths:
-    - ./target
-    - ./.cargo
-
 .releaseable_branches:             # list of git refs for building GitLab artifacts (think "pre-release binaries")
   only:                            &releaseable_branches
     - stable