Use GitHub Actions (#9) * Create build-container.yml * Update build-container.yml * Update build-container.yml * Update a yml for GitHub Actions * Update build-container.yml * Update Dockerfile * Update cyrest.version * Update Dockerfile * Create docker-compose.yml * Remove Dockerfiles for py4cy and RCy3 * Update docker-compose.yml * Add fluxbox to Cytoscape Desktop env * Use .env file to set PORT number or SCREEN size * Update build-container.yml