reordered save cache, added back explicit mod download

Author: cotarg

.circleci/config.yml

@@ -25,7 +25,14 @@ jobs:
       - restore_cache:
           keys:
             - go-getter-modcache-v1-{{ checksum "go.mod" }}
-            - go-getter-modcache-v1
+
+      - run: go mod download
+
+      # Save go module cache if the go.mod file has changed
+      - save_cache:
+          key: go-getter-modcache-v1-{{ checksum "go.mod" }}
+          paths:
+            - "/go/pkg/mod"
 
       # check go fmt output because it does not report non-zero when there are fmt changes
       - run:
@@ -47,12 +54,6 @@ jobs:
       - store_artifacts:
           path: *TEST_RESULTS_PATH
 
-      # Save go module cache if the go.mod file has changed
-      - save_cache:
-          key: go-getter-modcache-v1-{{ checksum "go.mod" }}
-          paths:
-            - "/go/pkg/mod"
-
 workflows:
   version: 2
   test-and-build: