Add main or master branch condition

.woodpecker/release.yml

@@ -3,6 +3,7 @@ pipeline:
     image: python:latest
     when:
       event: tag
+      branch: [ main, master ]
     commands:
       - python --version
       - pip install -U build --quiet
@@ -12,6 +13,7 @@ pipeline:
     image: python:latest
     when:
       event: tag
+      branch: [ main, master ]
     secrets: [ twine_username, twine_password ]
     commands:
       - pip install -U twine --quiet