v0.2.14 : support GITHUB_TOKEN/GH_TOKEN pour l API GitHub (limite 60 -> 5000 requetes/h) et message clair sur le rate limit 403

src/download.rs

@@ -139,17 +139,31 @@ pub struct GhRelease {
     pub assets: Vec<GhAsset>,
 }
 
+/// Authorization header for api.github.com when GITHUB_TOKEN or GH_TOKEN
+/// is set (raises the rate limit from 60 to 5000 requests/hour).
+fn github_auth_header() -> Option<String> {
+    let token = std::env::var("GITHUB_TOKEN")
+        .or_else(|_| std::env::var("GH_TOKEN"))
+        .ok()
+        .filter(|t| !t.trim().is_empty())?;
+    Some(format!("Bearer {}", token.trim()))
+}
+
 pub fn latest_release(repo: &str) -> Result<GhRelease> {
     let url = format!("https://api.github.com/repos/{repo}/releases/latest");
-    let resp = ureq::get(&url)
-        .set("User-Agent", USER_AGENT)
-        .call()
-        .map_err(|e| match e {
-            ureq::Error::Status(404, _) => {
-                anyhow!("no GitHub releases found for repository '{repo}'")
-            }
-            other => anyhow!("GitHub API request failed for '{repo}': {other}"),
-        })?;
+    let mut req = ureq::get(&url).set("User-Agent", USER_AGENT);
+    if let Some(auth) = github_auth_header() {
+        req = req.set("Authorization", &auth);
+    }
+    let resp = req.call().map_err(|e| match e {
+        ureq::Error::Status(404, _) => {
+            anyhow!("no GitHub releases found for repository '{repo}'")
+        }
+        ureq::Error::Status(403, _) => anyhow!(
+            "GitHub API request failed for '{repo}': rate limit exceeded — set the GITHUB_TOKEN environment variable to raise the limit, or retry in a few minutes"
+        ),
+        other => anyhow!("GitHub API request failed for '{repo}': {other}"),
+    })?;
     let text = resp
         .into_string()
         .context("reading GitHub API response")?;