Change releases to put news in tags

Stop using the NEWS file and put release news into the tag description.
Use https://github.com/cockpit-project/action-release/ to publish the
GitHub release.

.github/workflows/release.yml

@@ -20,12 +20,9 @@ jobs:
         run: ./setup.py sdist
 
       - name: Create GitHub release
-        uses: docker://antonyurchenko/git-release:latest
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          CHANGELOG_FILE: "NEWS"
+        uses: cockpit-project/action-release@62db9d9850a1adec300500d84035c4f523fd5290
         with:
-          args: dist/python-dbusmock-*.tar.gz
+          filename: "python-dbusmock-${{ github.ref_name }}.tar.xz"
 
       - name: Create PyPy release
         uses: pypa/gh-action-pypi-publish@master

NEWS

@@ -1,3 +1,5 @@
+OBSOLETE: Release news of newer versions are contained in the git tag descriptions.
+
 ## [0.27.5] - 2022-04-05
 - bluez and accountsservice templates: Drop default arguments from D-Bus methods (thanks Simon McVittie)
 

setup.py

@@ -1,13 +1,14 @@
 #!/usr/bin/python3
 '''python-dbusmock - Mock D-Bus objects for testing'''
 
+import subprocess
+
 import setuptools
 
 with open('README.md', encoding="UTF-8") as f:
     readme = f.read()
 
-with open('NEWS', 'r', encoding="UTF-8") as f:
-    version = f.readline().split('[')[1].split(']')[0]
+version = subprocess.check_output(['git', 'describe'], universal_newlines=True).strip()
 
 setuptools.setup(
     name='python-dbusmock',