fix(ci): fix release creation and artifact collection

- Exclude appimagetool from artifact upload (FreeCAD_*.AppImage glob)
- Build release JSON payload in Python to fix false/False type error
  (shell 'false' is not valid Python; use bool with re.search instead)

.gitea/workflows/release.yml

@@ -131,7 +131,7 @@ jobs:
         with:
           name: release-linux
           path: |
-            package/rattler-build/linux/*.AppImage
+            package/rattler-build/linux/FreeCAD_*.AppImage
             package/rattler-build/linux/*.deb
             package/rattler-build/linux/*-SHA256.txt
             package/rattler-build/linux/*.sha256
@@ -347,12 +347,13 @@ jobs:
           REPO: ${{ github.repository }}
         run: |
           TAG="${BUILD_TAG}"
-          PRERELEASE=false
-          if echo "$TAG" | grep -qE '(rc|beta|alpha)'; then
-            PRERELEASE=true
-          fi
 
-          BODY="## Kindred Create ${TAG}
+          # Build JSON payload entirely in Python to avoid shell/Python type mismatches
+          PAYLOAD=$(python3 -c "
+          import json, re
+          tag = '${TAG}'
+          prerelease = bool(re.search(r'(rc|beta|alpha)', tag))
+          body = '''## Kindred Create {tag}
 
           ### Downloads
 
@@ -363,7 +364,14 @@ jobs:
 
           *macOS and Windows builds are not yet available.*
 
-          SHA256 checksums are provided alongside each artifact."
+          SHA256 checksums are provided alongside each artifact.'''.format(tag=tag)
+          print(json.dumps({
+              'tag_name': tag,
+              'name': f'Kindred Create {tag}',
+              'body': body,
+              'prerelease': prerelease,
+          }))
+          ")
 
           # Delete existing release for this tag (if any) so we can recreate
           existing=$(curl -s -o /dev/null -w "%{http_code}" \
@@ -384,12 +392,7 @@ jobs:
           release_id=$(curl -s -X POST \
             -H "Authorization: token ${GITEA_TOKEN}" \
             -H "Content-Type: application/json" \
-            -d "$(python3 -c "import json; print(json.dumps({
-              'tag_name': '${TAG}',
-              'name': 'Kindred Create ${TAG}',
-              'body': '''${BODY}''',
-              'prerelease': ${PRERELEASE}
-            }))")" \
+            -d "$PAYLOAD" \
             "${GITEA_URL}/api/v1/repos/${REPO}/releases" | \
             python3 -c "import sys,json; print(json.load(sys.stdin)['id'])")
           echo "Created release ${release_id}"