Continue trying other auth if credHelper or credsStore fails

Signed-off-by: Rasmus Faber-Espensen <rfaber@gmail.com>

Author: rasmusfaber

oras/auth/base.py

@@ -64,7 +64,7 @@ def logout(self, hostname: str):
     def _logout(self):
         pass
 
-    def _get_auth_from_creds_store(self, binary: str, hostname: str) -> str:
+    def _get_auth_from_creds_store(self, binary: str, hostname: str) -> str | None:
         try:
             proc = subprocess.run(
                 [binary, "get"],
@@ -73,14 +73,12 @@ def _get_auth_from_creds_store(self, binary: str, hostname: str) -> str:
                 stderr=subprocess.PIPE,
                 check=True,
             )
-        except FileNotFoundError as exc:
-            raise RuntimeError(
-                f"Credential helper '{binary}' not found in PATH"
-            ) from exc
+        except FileNotFoundError:
+            logger.warning(f"Credential helper '{binary}' not found in PATH")
+            return None
         except subprocess.CalledProcessError as exc:
-            raise RuntimeError(
-                f"Credential helper '{binary}' failed: {exc.stderr.decode().strip()}"
-            ) from exc
+            logger.warning(f"Credential helper '{binary}' failed: {exc.stderr.decode().strip()}")
+            return None
         payload = json.loads(proc.stdout)
         return auth_utils.get_basic_auth(payload["Username"], payload["Secret"])