WIP: Resolve "CI : pass fmt job to stable version"

Closes #61 (closed)

.gitlab-ci.yml

 stages:
     - build_and_tests
-    - clippy
     - fmt
+    - clippy
     
 before_script:
     - export PATH="$HOME/.cargo/bin:$PATH"
@@ -32,27 +32,24 @@ build_and_tests:nightly:
     - cargo test --all-features
   when: manual
   allow_failure: true
-  
-clippy:
-  stage: clippy
-  image: rustlang/rust:nightly
+
+fmt:
+  stage: fmt
   tags:
-    - redshift-rs-nightly
+    - redshift-rs-stable
   before_script:
     - export PATH="$HOME/.cargo/bin:$PATH"
-    - cargo install --force clippy --verbose
   script:
-    - cargo clippy --all -- -D warnings --verbose
-  allow_failure: true  
+    - cargo fmt --force --all -- --write-mode=diff
   
-fmt:
-  stage: fmt
+clippy:
+  stage: clippy
   image: rustlang/rust:nightly
   tags:
     - redshift-rs-nightly
   before_script:
     - export PATH="$HOME/.cargo/bin:$PATH"
-    - cargo install --force rustfmt-nightly
+    - cargo install --force clippy --verbose
   script:
-    - cargo fmt -- --write-mode=diff
-  allow_failure: true
+    - cargo clippy --all -- -D warnings --verbose
+  allow_failure: true  
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