Circleci adds CACHEVER to be able to bust cache on demand

.circleci/config.yml

@@ -6,20 +6,24 @@ jobs:
 #      - image: springcloud/pipeline-base
     environment:
       _JAVA_OPTIONS: "-Xms1024m -Xmx2048m"
+      CACHEVER: 3
       TERM: dumb
     branches:
       ignore:
         - gh-pages # list of branches to ignore
     steps:
       - checkout
-#      - restore_cache:
-#          key: sc-gateway-{{ .Branch }}
+      - type: shell
+        name: "Write CACHEVER to file"
+        command: echo "$CACHEVER" > ~/CACHEVER.txt
+      - restore_cache:
+          key: sc-gateway-{{ .Branch }}-{{ checksum "~/CACHEVER.txt" }}
       - run:
           name: "Download dependencies"
           command: |
             ./mvnw -s .settings.xml -U --fail-never dependency:go-offline || true
       - save_cache:
-          key: sc-gateway-{{ .Branch }}
+          key: sc-gateway-{{ .Branch }}-{{ checksum "~/CACHEVER.txt" }}
           paths:
             - ~/.m2
       - run: