gitlab-ci: update gradle: job to only check files in

While we are at it, also upgrade to Debian/trixie and rules:

this now handles making the merge requests:
https://gitlab.com/fdroid/gradle-transparency-log/-/merge_requests/2

tests/gradle-release-checksums.py

@@ -1,7 +1,5 @@
 #!/usr/bin/env python3
 
-import git
-import gitlab
 import os
 import re
 import requests
@@ -90,62 +88,6 @@ plugin_v_pat = re.compile(r'\nplugin_v=\(([0-9. ]+)\)')
 with open('gradlew-fdroid', 'w') as fp:
     fp.write(plugin_v_pat.sub('\nplugin_v=(%s)' % plugin_v, gradlew_fdroid))
 
-if os.getenv('CI_PROJECT_NAMESPACE') != 'fdroid':
-    p = subprocess.run(['git', '--no-pager', 'diff'])
-    print(p.stdout)
-    sys.exit(errors)
-
-# This only runs after commits are pushed to fdroid/fdroidserver
-git_repo = git.repo.Repo('.')
-modified = git_repo.git().ls_files(modified=True).split()
-if git_repo.is_dirty() and ('gradlew-fdroid' in modified or 'makebuildserver' in modified):
-    private_token = os.getenv('PERSONAL_ACCESS_TOKEN')
-    if not private_token:
-        print(Fore.RED
-              + 'ERROR: GitLab Token not found in PERSONAL_ACCESS_TOKEN!'
-              + Style.RESET_ALL)
-        sys.exit(1)
-
-    branch = git_repo.create_head(os.path.basename(__file__), force=True)
-    branch.checkout()
-    git_repo.index.add(['gradlew-fdroid', 'makebuildserver'])
-    author = git.Actor('fdroid-bot', 'fdroid-bot@f-droid.org')
-    git_repo.index.commit('gradle v' + version, author=author)
-    project_path = 'fdroid-bot/' + os.getenv('CI_PROJECT_NAME')
-    url = ('https://gitlab-ci-token:%s@%s/%s.git'
-           % (os.getenv('PERSONAL_ACCESS_TOKEN'), os.getenv('CI_SERVER_HOST'), project_path))
-    remote_name = 'fdroid-bot'
-    try:
-        remote = git_repo.create_remote(remote_name, url)
-    # See https://github.com/PyCQA/pylint/issues/2856 .
-    # pylint: disable-next=no-member
-    except git.exc.GitCommandError:
-        remote = git.remote.Remote(git_repo, remote_name)
-        remote.set_url(url)
-    remote.push(force=True)
-    git.remote.Remote.rm(git_repo, remote_name)
-
-    gl = gitlab.Gitlab(os.getenv('CI_SERVER_URL'), api_version=4,
-                       private_token=private_token)
-    project = gl.projects.get(project_path, lazy=True)
-    description = (
-        'see <https://gitlab.com/fdroid/gradle-transparency-log/-/blob/master/checksums.json>'
-        '\n\n<p><small>generated by <a href="%s/-/jobs/%s">GitLab CI Job #%s</a></small></p>'
-        % (os.getenv('CI_PROJECT_URL'), os.getenv('CI_JOB_ID'), os.getenv('CI_JOB_ID'))
-    )
-    try:
-        mr = project.mergerequests.create({
-            'source_branch': branch.name,
-            'target_project_id': 36527,  # fdroid/fdroidserver
-            'target_branch': 'master',
-            'title': 'update to gradle v' + version,
-            'description': description,
-            'labels': ['fdroid-bot', 'gradle'],
-            'remove_source_branch': True,
-        })
-        mr.save()
-    except gitlab.exceptions.GitlabCreateError as e:
-        if e.response_code == 409:  # Another open merge request already exists for this source branch
-            print(e.error_message)
-        else:
-            raise e
+p = subprocess.run(['git', '--no-pager', 'diff'])
+errors += p.returncode
+sys.exit(errors)