Resolve "Add gitlab-ci runner for `clippy` (linting)"

Closes #16 (closed)

.gitlab-ci.yml

@@ -2,6 +2,7 @@ stages:
     - builds
     - tests
     - fmt
+    - clippy
     
 before_script:
     - export PATH="$HOME/.cargo/bin:$PATH"
@@ -52,3 +53,14 @@ fmt:
     - cargo fmt -- --write-mode=diff
   allow_failure: true
 
+clippy:
+  stage: clippy
+  image: rustlang/rust:nightly
+  tags:
+    - redshift-rs-nightly
+  before_script:
+    - export PATH="$HOME/.cargo/bin:$PATH"
+    - cargo install --force clippy
+  script:
+    - cargo clippy
+  allow_failure: true
\ No newline at end of file