use needs to specify CI dependency graph for more efficiency

.gitlab-ci.yml

@@ -62,18 +62,22 @@ build-nightly:
 
 test-stable:
   extends: .cargo-test
+  needs: ["build-stable"]
 
 test-msrv:
   extends: test-stable
   image: "rust:1.43.0"
+  needs: ["build-msrv"]
 
 test-nightly:
   extends: test-stable
   image: "rustlang/rust:nightly"
+  needs: ["build-nightly"]
 
 # VERSION
 
 fif-version:
   stage: version
+  needs: ["build-stable"]
   script:
     cargo run -- -V