Use most recent tag to deploy docs on manual dispatch

.github/workflows/publish-docs.yml

@@ -2,7 +2,7 @@ name: Publish docs
 on:
   push:
     tags: # See PEP 440 for valid version format
-      - "*.*.*" # For docs bump, use X.X.XaX
+      - "*.*.*" # For docs bump, use workflow_dispatch
     branches:
       - test_branch
   workflow_dispatch: # Manually trigger with 'Run workflow' button
@@ -40,8 +40,8 @@ jobs:
           git config user.name 'github-actions[bot]' && git config user.email 'github-actions[bot]@users.noreply.github.com'
 
       - name: Deploy
-        run: |
-          FULL_VERSION=${{ github.ref_name }}
+        run: | # github.ref_name is branch name if dispatch
+          FULL_VERSION=${{ git describe --tags --abbrev=0 }}
           export MAJOR_VERSION=${FULL_VERSION:0:3}
           echo "OWNER: ${REPO_OWNER}. BUILD: ${MAJOR_VERSION}"
           bash ./docs/build-docs.sh push $REPO_OWNER