Refactor CI/CD workflow to utilize NixOS VM for testing

- Changed the CI workflow to run tests inside a NixOS virtual machine instead of directly on the runner.
- Updated the NixOS VM configuration to include necessary dependencies and services for testing.
- Added a script to handle test execution within the VM, including setup for Python and Node.js environments.
- Implemented SSH access to the VM for remote operations and streamlined the process of starting and stopping the VM during tests.
- Enhanced the workflow to build the VM and copy the codebase for testing, ensuring a more isolated and consistent testing environment.

scripts/run-tests-in-vm.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# Helper script to run tests inside the VM
+# This script is executed inside the VM
+
+set -e
+
+cd /tmp/moviemap
+
+echo "=== Setting up test environment ==="
+
+# Setup Python
+cd backend
+export PATH="/root/.local/bin:$PATH"
+python3 -m pip install --user --upgrade pip
+python3 -m pip install --user -r requirements.txt
+
+# Setup Node.js
+cd ../frontend
+npm ci
+
+echo "=== Waiting for PostgreSQL ==="
+# Wait for PostgreSQL to be ready
+for i in {1..30}; do
+  if sudo -u postgres psql -c "SELECT 1;" > /dev/null 2>&1; then
+    echo "PostgreSQL is ready"
+    break
+  fi
+  if [ $i -eq 30 ]; then
+    echo "PostgreSQL failed to start"
+    exit 1
+  fi
+  sleep 1
+done
+
+echo "=== Running database migrations ==="
+cd ../backend
+export POSTGRES_SOCKET_PATH=/var/run/postgresql
+export POSTGRES_DB=moviemap_test
+export POSTGRES_USER=moviemap
+export PATH="/root/.local/bin:$PATH"
+alembic upgrade head
+
+echo "=== Running backend tests ==="
+export TEST_POSTGRES_DB=moviemap_test
+export TEST_POSTGRES_USER=moviemap
+export TEST_POSTGRES_SOCKET_PATH=/var/run/postgresql
+export RADARR_URL=http://localhost:7878
+export SONARR_URL=http://localhost:8989
+export LIDARR_URL=http://localhost:8686
+export RADARR_API_KEY=test-key
+export SONARR_API_KEY=test-key
+export LIDARR_API_KEY=test-key
+export PATH="/root/.local/bin:$PATH"
+pytest tests/ -v --cov=app --cov-report=term-missing
+
+echo "=== Building frontend ==="
+cd ../frontend
+npm run build
+
+echo "=== Running frontend tests ==="
+npm test -- --run
+
+echo "=== All tests completed successfully ==="
+