cache using test

.gitlab-ci.yml

@@ -2,6 +2,11 @@ stages:
 - build
 - upload
 
+cache:
+   key: "$CI_COMMIT_REF_SLUG"
+   paths:
+     - build
+
 .build_docker_images:
   image: docker:stable
   before_script:
@@ -48,8 +53,6 @@ images_build:
     - docker build -t $BADSSL_IMAGE_TAG -f ./badssl.com/Dockerfile ./badssl.com/
     - docker save $BADSSL_IMAGE_TAG  > build/badssl.tar
     - pwd && ls -halt ./* && ls -halt ./build
-  cache:
-    key: images-save
     paths:
       - build
 
@@ -65,8 +68,6 @@ rpm_build:
   script:
     - pwd && ls -halt ./*
     - ls -halt ./build
-  cache:
-    key: images-save
   dependencies:
     - images_build
   only: