Use Gitlab-CI cache to keep ccache data

.gitlab-ci.yml

@@ -28,8 +28,12 @@ build:gcc8:opt:
   artifacts:
     paths:
       - ${BUILDDIR}
-      - .ccache
     expire_in: 1 week
+  cache:
+    key: "$CI_JOB_NAME-$CI_COMMIT_REF_SLUG"
+    paths:
+      - .ccache
+    
 
 build:gcc8:dbg:
   stage: build
@@ -43,8 +47,11 @@ build:gcc8:dbg:
   artifacts:
     paths:
       - ${BUILDDIR}
-      - .ccache
     expire_in: 1 week
+  cache:
+    key: "$CI_JOB_NAME-$CI_COMMIT_REF_SLUG"
+    paths:
+      - .ccache
 
 check-formatting:
   stage: build
@@ -130,10 +137,10 @@ test_public_headers_build:
     BUILDDIR: build-opt
   script:
     - ci-utils/test_public_headers_build
-  artifacts:
+  cache:
+    key: "$CI_JOB_NAME-$CI_COMMIT_REF_SLUG"
     paths:
       - .ccache
-    expire_in: 1 week
 
 # see https://gitlab.cern.ch/gitlabci-examples/deploy_eos for the details
 # of the configuration

ci-utils/build

@@ -2,14 +2,7 @@
 
 . $(dirname $0)/env_setup.sh
 
-if [ -n "${CI}" ] ; then
-  url="${CI_PROJECT_URL}/-/jobs/artifacts/${CI_COMMIT_REF_NAME}/download?job=${CI_JOB_NAME}"
-  echo "downloading '${url}'"
-  curl -o artifacts.zip --location "${url}"
-  unzip -q artifacts.zip '.ccache/*' || true
-fi
-
-${LCG_release_area}/ccache/${CCACHE_VERSION}/${BINARY_TAG}/bin/ccache -z -M 1G
+${LCG_release_area}/ccache/${CCACHE_VERSION}/${BINARY_TAG}/bin/ccache -z -F 2000
 
 echo 'set(CMAKE_USE_CCACHE ON CACHE BOOL "")' >> cache_preload.cmake
 

ci-utils/test_public_headers_build

@@ -2,12 +2,7 @@
 
 . $(dirname $0)/env_setup.sh
 
-if [ -n "${CI}" ] ; then
-  url="${CI_PROJECT_URL}/-/jobs/artifacts/${CI_COMMIT_REF_NAME}/download?job=${CI_JOB_NAME}"
-  echo "downloading '${url}'"
-  curl -o artifacts.zip --location "${url}"
-  unzip -q artifacts.zip '.ccache/*' || true
-fi
+${LCG_release_area}/ccache/${CCACHE_VERSION}/${BINARY_TAG}/bin/ccache -z -F 2000
 
 # make sure we do not re-run cmake
 find ${BUILDDIR} -type f -exec touch -d $(date +@%s) \{} \;