fix: collapse python3 one-liner to fix YAML indentation error

Multi-line python3 -c "..." had unindented code outside the run: | block,
causing 'yaml: line 83: could not find expected :'. Collapsed to a single
indented line so the YAML parser sees it correctly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -79,20 +79,7 @@ jobs:
 
       - name: Create Gitea release
         run: |
-          python3 -c "
+          python3 -c "import json,os; v=os.environ['VERSION']; img=os.environ['IMAGE']; notes=open('/tmp/release_notes.txt').read(); open('/tmp/release_body.json','w').write(json.dumps({'tag_name':'v'+v,'name':'Catalyst v'+v,'body':'### Changes\n\n'+notes+'\n\n### Image\n\n'+img+':'+v,'draft':False,'prerelease':False}))"
-import json, os
-notes = open('/tmp/release_notes.txt').read()
-version = os.environ['VERSION']
-image = os.environ['IMAGE']
-payload = {
-    'tag_name': 'v' + version,
-    'name': 'Catalyst v' + version,
-    'body': '### Changes\n\n' + notes + '\n\n### Image\n\n\`' + image + ':' + version + '\`',
-    'draft': False,
-    'prerelease': False,
-}
-print(json.dumps(payload))
-" > /tmp/release_body.json
           curl -sf -X POST \
             -H "Authorization: token ${{ secrets.TOKEN }}" \
             -H "Content-Type: application/json" \