do a build with default features before all the customised builds, should help speed things up more

.gitlab-ci.yml

@@ -16,20 +16,22 @@ default:
 stages:
   - lint
   - cache-cleanup
+  - build-base
   - build
   - version
   - test
 
-# TEMPLATE
-.cargo-build:
-  stage: build
-  parallel:
-    matrix:
-      - FEATURES:
-        - xdg-mime-backend
-        - infer-backend
-        - multi-threaded xdg-mime-backend
-        - multi-threaded infer-backend
+# TEMPLATES
+
+.cargo-cleanup:
+  stage: cache-cleanup
+  allow_failure: true
+  script:
+    - cargo install cargo-sweep
+    - cargo sweep -i
+
+.cargo-build-base:
+  stage: build-base
 
   only:
     refs:
@@ -40,14 +42,21 @@ stages:
       - .gitlab-ci.yml
 
   script:
-    cargo build --no-default-features --locked --features="json $FEATURES"
+    cargo build --locked
+
+.cargo-build:
+  extends: .cargo-build-base
+  stage: build
+  parallel:
+    matrix:
+      - FEATURES:
+        - xdg-mime-backend
+        - infer-backend
+        - multi-threaded xdg-mime-backend
+        - multi-threaded infer-backend
 
-.cargo-cleanup:
-  stage: cache-cleanup
-  allow_failure: true
   script:
-    - cargo install cargo-sweep
-    - cargo sweep -i
+    cargo build --no-default-features --locked --features="json $FEATURES"
 
 .cargo-test:
   extends: .cargo-build
@@ -86,15 +95,40 @@ cleanup-nightly:
       - target
       - .cargo
 
+# BUILD BASE
+build-base-stable:
+  extends: .cargo-build-base
+  needs: ["cleanup-stable"]
+
+build-base-msrv:
+  extends: build-base-stable
+  needs: ["cleanup-msrv"]
+  image: "rust:1.43.0"
+  cache:
+    key: msrv
+    paths:
+      - target
+      - .cargo
+
+build-base-nightly:
+  extends: build-base-stable
+  needs: ["cleanup-nightly"]
+  image: "rustlang/rust:nightly"
+  cache:
+    key: nightly
+    paths:
+      - target
+      - .cargo
+
 # BUILD
 
 build-stable:
   extends: .cargo-build
-  needs: ["cleanup-stable"]
+  needs: ["build-base-stable"]
 
 build-msrv:
   extends: build-stable
-  needs: ["cleanup-msrv"]
+  needs: ["build-base-msrv"]
   image: "rust:1.43.0"
   cache:
     key: msrv
@@ -104,7 +138,7 @@ build-msrv:
 
 build-nightly:
   extends: build-stable
-  needs: ["cleanup-nightly"]
+  needs: ["build-base-nightly"]
   image: "rustlang/rust:nightly"
   cache:
     key: nightly