workflows: deploy docs when on a tag

Author: amorison

.github/workflows/docs.yml

@@ -31,7 +31,7 @@ jobs:
 
   deploy:
     needs: build
-    if: github.ref == 'refs/heads/master'
+    if: ${{ github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/v') }}
     permissions:
       pages: write
       id-token: write