Merge pull request #904 from MetOffice/903_tls_certificate_strict_che…

…cking

Disable strict checking that TLS certificates are well formed

src/CSET/_workflow_utils/fetch_data.py

@@ -123,6 +123,8 @@ def get_file(self, file_path: str, output_dir: str) -> bool:
             True if files were transferred, otherwise False.
         """
         ctx = ssl.create_default_context()
+        # Needed to enable compatibility with malformed iBoss TLS certificates.
+        ctx.verify_flags &= ~ssl.VERIFY_X509_STRICT
         save_path = (
             f"{output_dir.removesuffix('/')}/"
             + urllib.parse.urlparse(file_path).path.split("/")[-1]