Clean the RUNNER_ARTIFACTS_DIR before copying the doc build artifacts (…

…pytorch#1103)

Summary:
Pull Request resolved: pytorch#1103

Remove everything from the RUNNER_ARTIFACT_DIR before uploading the new doc build.
Fixes pytorch#1093

Reviewed By: huydhn, dbort

Differential Revision: D50661683

fbshipit-source-id: 7e34bc8b03ceeb744f16842d40a0e65cab5ecf95

.github/workflows/doc-build.yml

@@ -56,6 +56,11 @@ jobs:
 
         set -eux
 
+        # clean up the ${RUNNER_DOCS_DIR} if exists:
+        rm -rf "${RUNNER_DOCS_DIR}"/*
+        # clean up the ${RUNNER_ARTIFACT_DIR} if exists:
+        rm -rf "${RUNNER_ARTIFACT_DIR}"/*
+
         # Build docset:
         cd docs
         doxygen source/Doxyfile
@@ -64,10 +69,10 @@ jobs:
 
         cp -rf docs/_build/html/* "${RUNNER_DOCS_DIR}"
 
-        # Sometimes the artifact directory already contains an "html" subdir.
-        rm -rf "${RUNNER_ARTIFACT_DIR}/html"
         mv docs/_build/html "${RUNNER_ARTIFACT_DIR}"
 
+        ls -R "${RUNNER_ARTIFACT_DIR}"/*/*.html
+
 # Enable preview later. Previews are available publicly
 #
 # upload-preview: