Update stats-config to be more deterministic

[ijjk]

Adds generateBuildId config to keep the BUILD_ID the same each run

[ijjk]

Stats from current PR

Default Server Mode

General

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
buildDuration	23.3s	23.4s	⚠️ +130ms
nodeModulesSize	42.4 MB	42.4 MB	✓

Client Bundles (main, webpack, commons)

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
main-HASH.js	18.2 kB	18.2 kB	✓
main-HASH.js gzip	6.64 kB	6.64 kB	✓
webpack-HASH.js	1.53 kB	1.53 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
4952ddcd88e7..2b8407376.js	21.9 kB	21.9 kB	✓
4952ddcd88e7..7376.js gzip	7.81 kB	7.81 kB	✓
de003c3a9d30..799a4e38e.js	43.1 kB	43.1 kB	✓
de003c3a9d30..e38e.js gzip	15.4 kB	15.4 kB	✓
framework.5b..dbaff70d3.js	125 kB	125 kB	✓
framework.5b..70d3.js gzip	39.4 kB	39.4 kB	✓
Overall change	210 kB	210 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
main-HASH.module.js	16.6 kB	16.6 kB	✓
main-HASH.module.js gzip	6.38 kB	6.38 kB	✓
webpack-HASH.module.js	1.53 kB	1.53 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..f0.module.js	45.5 kB	45.5 kB	✓
de003c3a9d30..dule.js gzip	16.5 kB	16.5 kB	✓
framework.5b..d3.module.js	125 kB	125 kB	✓
framework.5b..dule.js gzip	39.4 kB	39.4 kB	✓
Overall change	189 kB	189 kB	✓

Client Pages

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
_app.js	1.83 kB	1.83 kB	✓
_app.js gzip	883 B	883 B	✓
_error.js	12.1 kB	12.1 kB	✓
_error.js gzip	4.74 kB	4.74 kB	✓
hooks.js	12.7 kB	12.7 kB	✓
hooks.js gzip	4.81 kB	4.81 kB	✓
index.js	343 B	343 B	✓
index.js gzip	237 B	237 B	✓
link.js	8.14 kB	8.14 kB	✓
link.js gzip	3.49 kB	3.49 kB	✓
routerDirect.js	433 B	433 B	✓
routerDirect.js gzip	296 B	296 B	✓
withRouter.js	444 B	444 B	✓
withRouter.js gzip	294 B	294 B	✓
Overall change	36 kB	36 kB	✓

Client Pages Modern

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
_app.module.js	1.73 kB	1.73 kB	✓
_app.module.js gzip	841 B	841 B	✓
_error.module.js	23.3 kB	23.3 kB	✓
_error.module.js gzip	8.6 kB	8.6 kB	✓
hooks.module.js	1.55 kB	1.55 kB	✓
hooks.module.js gzip	804 B	804 B	✓
index.module.js	319 B	319 B	✓
index.module.js gzip	238 B	238 B	✓
link.module.js	8.52 kB	8.52 kB	✓
link.module.js gzip	3.67 kB	3.67 kB	✓
routerDirect.module.js	419 B	419 B	✓
routerDirect..dule.js gzip	294 B	294 B	✓
withRouter.module.js	429 B	429 B	✓
withRouter.m..dule.js gzip	293 B	293 B	✓
Overall change	36.2 kB	36.2 kB	✓

Client Build Manifests

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
_buildManifest.js	81 B	81 B	✓
_buildManifest.js gzip	61 B	61 B	✓
_buildManifest.module.js	81 B	81 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	162 B	162 B	✓

Rendered Page Sizes

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
index.html	3.62 kB	3.62 kB	✓
index.html gzip	947 B	947 B	✓
link.html	3.66 kB	3.66 kB	✓
link.html gzip	955 B	955 B	✓
withRouter.html	3.67 kB	3.67 kB	✓
withRouter.html gzip	942 B	942 B	✓
Overall change	10.9 kB	10.9 kB	✓

---

Serverless Mode

General

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
buildDuration	23.4s	23.3s	-68ms
nodeModulesSize	42.4 MB	42.4 MB	✓

Client Bundles (main, webpack, commons)

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
main-HASH.js	18.2 kB	18.2 kB	✓
main-HASH.js gzip	6.64 kB	6.64 kB	✓
webpack-HASH.js	1.53 kB	1.53 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
4952ddcd88e7..2b8407376.js	21.9 kB	21.9 kB	✓
4952ddcd88e7..7376.js gzip	7.81 kB	7.81 kB	✓
de003c3a9d30..799a4e38e.js	43.1 kB	43.1 kB	✓
de003c3a9d30..e38e.js gzip	15.4 kB	15.4 kB	✓
framework.5b..dbaff70d3.js	125 kB	125 kB	✓
framework.5b..70d3.js gzip	39.4 kB	39.4 kB	✓
Overall change	210 kB	210 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
main-HASH.module.js	16.6 kB	16.6 kB	✓
main-HASH.module.js gzip	6.38 kB	6.38 kB	✓
webpack-HASH.module.js	1.53 kB	1.53 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..f0.module.js	45.5 kB	45.5 kB	✓
de003c3a9d30..dule.js gzip	16.5 kB	16.5 kB	✓
framework.5b..d3.module.js	125 kB	125 kB	✓
framework.5b..dule.js gzip	39.4 kB	39.4 kB	✓
Overall change	189 kB	189 kB	✓

Client Pages

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
_app.js	1.83 kB	1.83 kB	✓
_app.js gzip	883 B	883 B	✓
_error.js	12.1 kB	12.1 kB	✓
_error.js gzip	4.74 kB	4.74 kB	✓
hooks.js	12.7 kB	12.7 kB	✓
hooks.js gzip	4.81 kB	4.81 kB	✓
index.js	343 B	343 B	✓
index.js gzip	237 B	237 B	✓
link.js	8.14 kB	8.14 kB	✓
link.js gzip	3.49 kB	3.49 kB	✓
routerDirect.js	433 B	433 B	✓
routerDirect.js gzip	296 B	296 B	✓
withRouter.js	444 B	444 B	✓
withRouter.js gzip	294 B	294 B	✓
Overall change	36 kB	36 kB	✓

Client Pages Modern

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
_app.module.js	1.73 kB	1.73 kB	✓
_app.module.js gzip	841 B	841 B	✓
_error.module.js	23.3 kB	23.3 kB	✓
_error.module.js gzip	8.6 kB	8.6 kB	✓
hooks.module.js	1.55 kB	1.55 kB	✓
hooks.module.js gzip	804 B	804 B	✓
index.module.js	319 B	319 B	✓
index.module.js gzip	238 B	238 B	✓
link.module.js	8.52 kB	8.52 kB	✓
link.module.js gzip	3.67 kB	3.67 kB	✓
routerDirect.module.js	419 B	419 B	✓
routerDirect..dule.js gzip	294 B	294 B	✓
withRouter.module.js	429 B	429 B	✓
withRouter.m..dule.js gzip	293 B	293 B	✓
Overall change	36.2 kB	36.2 kB	✓

Client Build Manifests

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
_buildManifest.js	81 B	81 B	✓
_buildManifest.js gzip	61 B	61 B	✓
_buildManifest.module.js	81 B	81 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	162 B	162 B	✓

Serverless bundles

	zeit/next.js canary	ijjk/next.js update/stats-config	Change
_error.js	247 kB	247 kB	✓
_error.js gzip	66.1 kB	66.1 kB	✓
hooks.html	3.73 kB	3.73 kB	✓
hooks.html gzip	973 B	973 B	✓
index.js	248 kB	248 kB	✓
index.js gzip	66.5 kB	66.5 kB	✓
link.js	255 kB	255 kB	✓
link.js gzip	68.5 kB	68.5 kB	✓
routerDirect.js	249 kB	249 kB	✓
routerDirect.js gzip	66.5 kB	66.5 kB	✓
withRouter.js	248 kB	248 kB	✓
withRouter.js gzip	66.6 kB	66.6 kB	✓
Overall change	1.25 MB	1.25 MB	✓