Enable buildkit.

I copied it from a different project and I didn't check if it's needed at all.

Enable buildkit.
960463df · nimrod · ad24f813 · 960463df
Commit 960463df authored 3 years ago by nimrod
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,9 +13,6 @@ stages:
 build:
  extends: .compose-build
  tags: &tags [ns4.shore.co.il]
-  variables:
-    DOCKER_BUILDKIT: ""
-    COMPOSE_DOCKER_CLI_BUILD: ""

 pull:
  extends: .compose-pull