Bump ci-linux image for rust 1.68 (#411)

* Fix the trivial warning first

* fix(merge_request): avoid clippy warning pending a proper fix

fixes #412
closes #413

* Bump ci-linux image for rust 1.68

---------

Co-authored-by: rzadp <roopert7@gmail.com>

.gitlab-ci.yml

@@ -2,7 +2,7 @@ variables:
   KUBE_NAMESPACE:                  "processbot"
   CI_REGISTRY:                     "paritytech"
   BUILDAH_IMAGE:                   "quay.io/buildah/stable:v1.27"
-  CI_IMAGE:                        "paritytech/ci-linux@sha256:05ece6bd39131e35868babf911d19b7b570134d47b0455076ab162b233ed4157"
+  CI_IMAGE:                        "paritytech/ci-linux@sha256:7c76c3f9639f919447abbf9db535588178fde4df583d6926444d44cc20c094e6" # staging 2023-03-20
   GIT_STRATEGY:                    fetch
   GIT_DEPTH:                       3
   CARGO_TARGET_DIR:                "/ci-cache/${CI_PROJECT_NAME}/targets/${CI_COMMIT_REF_NAME}/${CI_JOB_NAME}"

src/github/client/mod.rs

@@ -183,7 +183,7 @@ impl GithubClient {
 
 	async fn execute(&self, builder: RequestBuilder) -> Result<Response> {
 		let request = builder
-			.bearer_auth(&self.auth_token().await?)
+			.bearer_auth(self.auth_token().await?)
 			.header(
 				header::ACCEPT,
 				"application/vnd.github.starfox-preview+json",

src/merge_request.rs

@@ -182,7 +182,8 @@ pub async fn cleanup_merge_request(
 		MergeRequestCleanupReason::Error
 		| MergeRequestCleanupReason::Cancelled => {
 			for dependent in related_dependents.values() {
-				let _ = cleanup_merge_request(
+				// TODO: these cleanup_merge_request() might not be actually executed rn, poll them?
+				let _result = cleanup_merge_request(
 					state,
 					&dependent.sha,
 					&dependent.owner,

tests/helpers/mod.rs

@@ -69,7 +69,7 @@ pub fn initialize_repository(repo_dir: &Path, initial_branch: &str) {
 		Some(repo_dir),
 		None,
 	);
-	fs::write(&repo_dir.join("README"), "").unwrap();
+	fs::write(repo_dir.join("README"), "").unwrap();
 	exec("git", &["add", "."], Some(&repo_dir), None);
 	exec(
 		"git",