* woodpecker-{agent,cli,server}: init at 0.15.3
* woodpecker-*: tweak packaging
* Use 'callPackage' to import 'common.nix'.
* Prefix the binaries with 'woodpecker-', removing the need for
'meta.mainProgram'.
* Remove IFD in 'mkYarnPackage' by committing 'package.json'.
* Simplify the server derivation, by not building it statically.
* Expose 'woodpecker-frontend' as a package for overriding purposes.
* Reduce package size for 'woodpecker-frontend' by just keeping the 'dist'
folder.
* Have common `ldflags` and `postBuild` values.
* woodpecker-server: expose front-end with 'passthru'
* woodpecker-server: add update script
Co-authored-by: 06kellyjac <dev@j-k.io>
