use cargo-sweep to clean up the cache every now and then

.gitlab-ci.yml

@@ -15,6 +15,7 @@ default:
 
 stages:
   - lint
+  - cache-cleanup
   - build
   - version
   - test
@@ -41,12 +42,22 @@ stages:
   script:
     cargo build --no-default-features --locked --features="json $FEATURES"
 
+.cargo-cleanup:
+  extends: .cargo-build
+  stage: cache-cleanup
+  allow_failure: true
+  script:
+    - cargo install cargo-sweep
+    - cargo sweep -i
+
 .cargo-test:
   extends: .cargo-build
   stage: test
   script:
     cargo test --no-default-features --locked --verbose --features="json $FEATURES"
 
+# LINT
+
 clippy:
   stage: lint
   script:
@@ -54,13 +65,37 @@ clippy:
     - cargo clippy --version
     - ./clippy.sh ci
 
+# CACHE CLEANUP
+cleanup-stable:
+  extends: .cargo-cleanup
+
+cleanup-msrv:
+  extends: cleanup-stable
+  image: "rust:1.43.0"
+  cache:
+    key: msrv
+    paths:
+      - target
+      - .cargo
+
+cleanup-nightly:
+  extends: cleanup-stable
+  image: "rustlang/rust:nightly"
+  cache:
+    key: nightly
+    paths:
+      - target
+      - .cargo
+
 # BUILD
 
 build-stable:
   extends: .cargo-build
+  needs: ["cleanup-stable"]
 
 build-msrv:
   extends: build-stable
+  needs: ["cleanup-msrv"]
   image: "rust:1.43.0"
   cache:
     key: msrv
@@ -70,6 +105,7 @@ build-msrv:
 
 build-nightly:
   extends: build-stable
+  needs: ["cleanup-nightly"]
   image: "rustlang/rust:nightly"
   cache:
     key: nightly