Publish the regenerated standard via a pull request

.github/workflows/update-standard.yml

@@ -35,11 +35,13 @@ jobs:
         with:
           name: new_standard
           path: dicom_standard/dist/*
-  test-and-commit:
+  test-and-open-pr:
     needs: make
-    name: Run tox and commit to master
+    name: Run tox and open a pull request
     runs-on: ubuntu-latest
-    continue-on-error: true
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ env.PYTHON_VERSION }}
@@ -66,9 +68,22 @@ jobs:
         if: steps.diff_files.outputs.diff_lines > 0
       - name: Run tests
         run: tox
-      # temporary disable "publish to master", which may commit the changes in an unapproved PR  
-      # - name: Publish to master
-      #   uses: mikeal/publish-to-github-action@master
-      #   env:
-      #     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      #   if: success() && steps.diff_files.outputs.diff_lines > 0
+      # Publish via a pull request rather than by committing straight to master, so
+      # regenerated data is reviewed before it lands. Runs only after tox has passed.
+      - name: Open pull request
+        if: steps.diff_files.outputs.diff_lines > 0
+        uses: peter-evans/create-pull-request@v8
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          base: master
+          branch: update-standard/${{ env.DICOM_VERSION }}
+          delete-branch: true
+          add-paths: standard/*.json
+          commit-message: 'Update standard to latest published revision'
+          title: 'Update standard (DICOM ${{ env.DICOM_VERSION }})'
+          body: |
+            Automated regeneration of `standard/*.json` from the current published
+            DICOM Standard, opened by the `update-standard` workflow.
+
+            The test suite (`tox`) passed against this data before the pull request
+            was created. Review the diff and merge to publish.