Use environment variables for GitHub Actions publishing

Author: tomkins

.github/workflows/publish.yml

@@ -70,23 +70,23 @@ jobs:
           name: python-package-distributions
           path: dist/
       - name: Sign packages
-        uses: sigstore/gh-action-sigstore-python@v2.1.1
+        uses: sigstore/gh-action-sigstore-python@v3.0.0
         with:
           inputs: >-
             ./dist/*.tar.gz
             ./dist/*.whl
       - name: Create GitHub Release
         env:
-          GITHUB_TOKEN: ${{ github.token }}
+          GH_TOKEN: ${{ github.token }}
         run: >-
           gh release create
-          '${{ github.ref_name }}'
-          --repo '${{ github.repository }}'
-          --title '${{ github.event.repository.name }} ${{ github.ref_name }}'
+          "$GITHUB_REF_NAME"
+          --repo "$GITHUB_REPOSITORY"
+          --title "${GITHUB_REPOSITORY#*/} $GITHUB_REF_NAME"
       - name: Upload artifact signatures to GitHub Release
         env:
-          GITHUB_TOKEN: ${{ github.token }}
+          GH_TOKEN: ${{ github.token }}
         run: >-
           gh release upload
-          '${{ github.ref_name }}' dist/**
-          --repo '${{ github.repository }}'
+          "$GITHUB_REF_NAME" dist/**
+          --repo "$GITHUB_REPOSITORY"