properly use separate caches for stable/msrv/nightly jobs

.gitlab-ci.yml

@@ -16,8 +16,8 @@ default:
 stages:
   - lint
   - build
-  - test
   - version
+  - test
 
 # TEMPLATE
 .cargo-build:
@@ -64,12 +64,26 @@ build-msrv:
   image: "rust:1.43.0"
   cache:
     key: msrv
+    paths:
+      - target
+      - .cargo
 
 build-nightly:
   extends: build-stable
   image: "rustlang/rust:nightly"
   cache:
     key: nightly
+    paths:
+      - target
+      - .cargo
+
+# VERSION
+
+fif-version:
+  stage: version
+  needs: ["build-stable"]
+  script:
+    cargo run -- -V
 
 # TEST
 
@@ -83,6 +97,9 @@ test-msrv:
   needs: ["build-msrv"]
   cache:
     key: msrv
+    paths:
+      - target
+      - .cargo
 
 test-nightly:
   extends: test-stable
@@ -90,11 +107,6 @@ test-nightly:
   needs: ["build-nightly"]
   cache:
     key: nightly
-
-# VERSION
-
-fif-version:
-  stage: version
-  needs: ["build-stable"]
-  script:
-    cargo run -- -V
+    paths:
+      - target
+      - .cargo