Skip AppImage and RPM builds to avoid slow 360MB+ compression

AppImage bundler compresses the entire sidecar.zip into squashfs,
causing builds to hang/timeout. Limit targets to deb (Linux),
nsis+msi (Windows), and dmg (macOS).

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

.gitea/workflows/build-linux.yml

@@ -103,7 +103,7 @@ jobs:
             exit 1
           fi
 
-          find src-tauri/target/release/bundle -type f \( -name "*.deb" -o -name "*.AppImage" \) | while IFS= read -r file; do
+          find src-tauri/target/release/bundle -type f -name "*.deb" | while IFS= read -r file; do
             filename=$(basename "$file")
             encoded_name=$(echo "$filename" | sed 's/ /%20/g')
             echo "Uploading ${filename} ($(du -h "$file" | cut -f1))..."