Add Linux build to release workflow, fix pytest exit code 5

- Add build-dist-linux.sh: venv-based tarball with systemd installer
- Add build-linux job to release.yml (parallel with build-windows)
- Include Linux download in release body
- Allow pytest to pass when no tests are collected (exit code 5)

build-dist-linux.sh

@@ -0,0 +1,126 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Build Linux distribution (self-contained venv + tarball)
+# Usage: ./build-dist-linux.sh [VERSION]
+
+# --- Version detection ---
+VERSION="${1:-}"
+
+if [ -z "$VERSION" ]; then
+    VERSION=$(git describe --tags --exact-match 2>/dev/null || true)
+fi
+
+if [ -z "$VERSION" ]; then
+    VERSION="${GITEA_REF_NAME:-${GITHUB_REF_NAME:-}}"
+fi
+
+if [ -z "$VERSION" ]; then
+    VERSION=$(grep -oP '__version__\s*=\s*"\K[^"]+' \
+      media_server/__init__.py 2>/dev/null || echo "0.0.0")
+fi
+
+VERSION_CLEAN="${VERSION#v}"
+echo "Building Media Server v${VERSION_CLEAN} for Linux"
+
+# --- Configuration ---
+DIST_DIR="dist/media-server"
+BUILD_OUTPUT="build/MediaServer-v${VERSION_CLEAN}-linux-x64"
+
+rm -rf dist build
+mkdir -p "${DIST_DIR}" build
+
+# --- Verify frontend bundle ---
+if [ ! -f "media_server/static/dist/app.bundle.js" ]; then
+    echo "ERROR: Frontend bundle not found. Run 'npm ci && npm run build' first."
+    exit 1
+fi
+
+# --- Create self-contained virtualenv ---
+echo "Creating virtualenv..."
+python3 -m venv "${DIST_DIR}/venv"
+source "${DIST_DIR}/venv/bin/activate"
+pip install --quiet --upgrade pip
+pip install --quiet ".[visualizer]"
+
+# Remove the installed package (app source is on PYTHONPATH via launcher)
+rm -rf "${DIST_DIR}"/venv/lib/python*/site-packages/media_server*
+rm -rf "${DIST_DIR}"/venv/lib/python*/site-packages/media_server*.dist-info
+
+deactivate
+
+# --- Copy application ---
+echo "Copying application files..."
+mkdir -p "${DIST_DIR}/app"
+cp -r media_server "${DIST_DIR}/app/"
+
+# Remove source JS (bundle is in dist/)
+rm -rf "${DIST_DIR}/app/media_server/static/js"
+# Remove source maps from release
+rm -f "${DIST_DIR}/app/media_server/static/dist/"*.map
+
+# Copy config example
+cp config.example.yaml "${DIST_DIR}/"
+
+# --- Write version ---
+echo "$VERSION_CLEAN" > "${DIST_DIR}/VERSION"
+
+# --- Create launcher ---
+cat > "${DIST_DIR}/media-server.sh" << 'LAUNCHER'
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+export PYTHONPATH="$SCRIPT_DIR/app"
+source "$SCRIPT_DIR/venv/bin/activate"
+exec python -m media_server.main "$@"
+LAUNCHER
+chmod +x "${DIST_DIR}/media-server.sh"
+
+# --- Create systemd service installer ---
+cat > "${DIST_DIR}/install-service.sh" << 'SERVICE'
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SERVICE_NAME="media-server"
+SERVICE_FILE="/etc/systemd/system/${SERVICE_NAME}.service"
+
+if [ "$EUID" -ne 0 ]; then
+    echo "Please run with sudo: sudo ./install-service.sh"
+    exit 1
+fi
+
+REAL_USER="${SUDO_USER:-$USER}"
+
+cat > "$SERVICE_FILE" << EOF
+[Unit]
+Description=Media Server
+After=network.target sound.target
+
+[Service]
+Type=simple
+User=${REAL_USER}
+WorkingDirectory=${SCRIPT_DIR}
+ExecStart=${SCRIPT_DIR}/media-server.sh
+Restart=on-failure
+RestartSec=5
+Environment=PYTHONUNBUFFERED=1
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl daemon-reload
+systemctl enable "${SERVICE_NAME}"
+systemctl start "${SERVICE_NAME}"
+echo "Service '${SERVICE_NAME}' installed and started."
+echo "Check status: systemctl status ${SERVICE_NAME}"
+SERVICE
+chmod +x "${DIST_DIR}/install-service.sh"
+
+# --- Package ---
+echo "Creating archive..."
+cp -r "${DIST_DIR}" "${BUILD_OUTPUT}"
+tar -czf "${BUILD_OUTPUT}.tar.gz" -C build "MediaServer-v${VERSION_CLEAN}-linux-x64"
+
+echo "Build complete: ${BUILD_OUTPUT}.tar.gz"