ci: Update to Swift 4.2.3, use official Docker images

Kitura / Kitura-WebSocket

WebSocket support for Kitura

Apache License 2.0

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ci: Update to Swift 4.2.3, use official Docker images #86

Closed djones6 closed 5 years ago

djones6 commented 5 years ago

Updates the CI to use the latest Swift 4.2.3 release, and the official Swift Docker images. Using the official Docker images can speed up CI build times as the build does not need manually installing from swift.org, and system dependencies are already set up.