Modify actions workflow conditions

This makes the workflow run on every pull request, this is helpful because it gives visibility to the maintainers that the tests are indeed passing before merging the PR. The publishing job is only run when a tag is given

.github/workflows/publish.yaml

@@ -4,9 +4,9 @@
 name: Publish BioPandas to PyPI / GitHub
 
 on:
- push:
- tags:
- - "v*"
+ pull_request:
+ branches: [ main ]
+
 jobs:
  test-style:
  name: Run style tests
@@ -47,7 +47,8 @@ jobs:
  run: pytest ./biopandas -sv
 
  build-n-publish:
- needs: test-pytest # only runs if tests are passing
+ needs: [test-pytest,test-style] # only runs if tests are passing
+ if: startsWith(github.ref, 'refs/tags/v') # Check if the tag starts with 'v'
  name: Build and publish to PyPI
  runs-on: ubuntu-latest