Implement RFC0032: Reloadable Process Types

[dmikusa]

RFC

Summary

Any relevant Paketo buildpacks should provide support to allow process reloading in the container.

WatchExec Buildpack

• Provide a utility buildpack to support language buildpacks in creating reloadable process types for their run containers.

Java Buildpacks

• Provide watchexec integration through BP_LIVE_RELOAD_ENABLED=true for paketo-buildpacks/spring-boot`.
• Provide watchexec integration through BP_LIVE_RELOAD_ENABLED=true for paketo-buildpacks/dist-zip`.
• Provide Spring Boot Dev Tools integration through BP_LIVE_RELOAD_ENABLED=true for paketo-buildpacks/spring-boot`.

Non-Java Buildpacks

• .NET Core: Enable BP_LIVE_RELOAD_ENABLED dotnet-core#591
• Go: add watchexec to order groups for BP_LIVE_RELOAD_ENABLED go#508
• Node.js: Add watchexec to order groups nodejs#484
• PHP: Implement RFC0032: Reloadable Process Types php#542
• Python: Add watchexec to python language family python#387
• Ruby: Implement RFC0032: Reloadable Process Types ruby#774
• Web Servers: Adds utility buidpacks web-servers#38