Try setup CI a bit more

.gitlab-ci.yml

@@ -3,12 +3,34 @@
 # https://hub.docker.com/r/library/rust/tags/
 image: "rust:latest"
 
+stages:
+  - test
+  - build
 
   # Use cargo to test the project
-test:cargo:
+test:
+  stage: test
   script:
-    - rustc --version && cargo --version  # Print version info for debugging
     - cargo test --all --verbose
   cache:
+    key: cargo_cache
     paths:
       - target/
+
+build:
+  stage: build
+  only:
+    - master
+    - tags
+  script:
+    - cargo build --release
+  cache:
+    key: cargo_cache
+    paths:
+      - target/
+  artifacts:
+    expire_in: 30 days
+    paths:
+      - target/release/summer
+      - target/release/summer.*
+