Temporary fix for staging-docs build

'pulp-docs build' can't be called from inside a folder called
pulpcore, regardless of it being the pulpcore repostiory or
an arbitrary folder.

[noissue]

.github/workflows/scripts/build_all_docs.sh

@@ -1,4 +1,11 @@
 # This script builds the documentation site for staging-docs.pulpproject.org
+
+# TODO: this chdir move is a tmp workaround. Remove when no longer needed.
+# see: https://github.com/mkdocstrings/python/issues/145
+mkdir ../build_dir && pushd ../build_dir
+
 pip install git+https://github.com/pulp/pulp-docs.git
 pulp-docs build
-tar cvf staging-docs.pulpproject.org.tar ./site
+tar cvf ../pulpcore/staging-docs.pulpproject.org.tar site
+
+popd