CI: fix publishing of PyPI package

.github/workflows/publish.yml

@@ -8,6 +8,13 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      contents: write
+      id-token: write
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+
     steps:
     - uses: actions/checkout@v4
       with:
@@ -21,30 +28,29 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install build twine virtualenv
+        pip install build virtualenv
 
     # PyPI package
-    - name: Build and publish
-      env:
-        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
-        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
-      run: |
-        python -m build
-        python -m twine upload dist/*
+    - name: Build Python package
+      run: python -m build
+
+    - name: Publish Python package to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
 
     # Github release
     - name: Read CHANGELOG
       id: changelog
       run: |
         # Get bullet points from last CHANGELOG entry
         CHANGELOG=$(git diff -U0 HEAD^ HEAD | grep '^[+][\* ]' | sed 's/\+//')
-        # Support for multiline, see
-        # https://github.com/actions/create-release/pull/11#issuecomment-640071918
-        CHANGELOG="${CHANGELOG//'%'/'%25'}"
-        CHANGELOG="${CHANGELOG//$'\n'/'%0A'}"
-        CHANGELOG="${CHANGELOG//$'\r'/'%0D'}"
         echo "Got changelog: $CHANGELOG"
-        echo "body=$CHANGELOG" >> $GITHUB_OUTPUT
+        # Support for multiline, see
+        # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#multiline-strings
+        {
+          echo 'body<<EOF'
+          echo "$CHANGELOG"
+          echo EOF
+        } >> "$GITHUB_OUTPUT"
 
     - name: Create release on Github
       id: create_release