Use stricter Bash options

Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>

Author: zware

.readthedocs.yml

@@ -20,7 +20,7 @@ build:
       # directory or RTD configuration, or if we can't cleanly merge the base
       # branch.
       - |
-        set -eux;
+        set -eEuxo pipefail;
         if [ "$READTHEDOCS_VERSION_TYPE" = "external" ];
         then
           base_branch=main;