feat: Improve debug logging in retry logic (#1485)

Author: majk-p

src/helpers.ts

@@ -185,15 +185,26 @@ export async function retryAndBackoff<T>(
     return await fn();
   } catch (err) {
     if (!isRetryable) {
+      core.debug(`retryAndBackoff: error is not retryable: ${errorMessage(err)}`);
       throw err;
     }
     // It's retryable, so sleep and retry.
-    await sleep(Math.random() * (2 ** retries * base));
-    retries += 1;
-    if (retries >= maxRetries) {
+    const delay = Math.random() * (2 ** retries * base);
+    const nextRetry = retries + 1;
+
+    core.debug(
+      `retryAndBackoff: attempt ${nextRetry} of ${maxRetries} failed: ${errorMessage(err)}. ` +
+        `Retrying after ${Math.floor(delay)}ms.`,
+    );
+
+    await sleep(delay);
+
+    if (nextRetry >= maxRetries) {
+      core.debug('retryAndBackoff: reached max retries; giving up.');
       throw err;
     }
-    return await retryAndBackoff(fn, isRetryable, maxRetries, retries, base);
+
+    return await retryAndBackoff(fn, isRetryable, maxRetries, nextRetry, base);
   }
 }