Only deploy docs when release is tagged

We only upload docs when a release is tagged, same constrain has to be
applied also to the deploy to avoid artifact not found errors.

While at it also schema checking the changed workflow file.

.github/workflows/main.yml

@@ -164,6 +164,7 @@ jobs:
         anaconda --verbose --token $ANACONDA_TOKEN upload --user ctools $LABEL conda-bld/*/*.tar.bz2 --force
 
   deploy:
+    if: startsWith(github.ref, 'refs/tags/')
     needs: upload
 
     # Grant GITHUB_TOKEN the permissions required to make a Pages deployment

.pre-commit-config.yaml

@@ -39,3 +39,9 @@ repos:
     rev: 7.1.1
     hooks:
       - id: flake8
+
+  - repo: https://github.com/python-jsonschema/check-jsonschema
+    rev: 0.29.4
+    hooks:
+      - id: check-dependabot
+      - id: check-github-workflows