feat: copy .env file in standalone mode

[balazsorban44]

Ref: #33897

I took a naive approach and simply added .env to the files that need to be copied.

Do we want to include .env.production as well? Ref: https://nextjs.org/docs/basic-features/environment-variables#loading-environment-variables

(I haven't tested what happens if the file does not exist on copy.)

Other files like .env.*local or .env.{test,development} don't make sense to copy.

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see contributing.md

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.
• Errors have helpful link attached, see contributing.md

Documentation / Examples

• Make sure the linting passes by running yarn lint

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
buildDuration	19.4s	19.7s	⚠️ +370ms
buildDurationCached	7.5s	7.4s	-116ms
nodeModulesSize	359 MB	359 MB	⚠️ +603 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
/ failed reqs	0	0	✓
/ total time (seconds)	4.245	4.254	⚠️ +0.01
/ avg req/sec	588.94	587.73	⚠️ -1.21
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	2.066	2.108	⚠️ +0.04
/error-in-render avg req/sec	1210.33	1186.06	⚠️ -24.27

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	27.9 kB	27.9 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.5 kB	71.5 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	326 B	326 B	✓
dynamic-HASH.js gzip	2.57 kB	2.57 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	919 B	919 B	✓
image-HASH.js gzip	5.01 kB	5.01 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.26 kB	2.26 kB	✓
routerDirect..HASH.js gzip	321 B	321 B	✓
script-HASH.js gzip	383 B	383 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.7 kB	14.7 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
buildDuration	23.4s	23.9s	⚠️ +529ms
buildDurationCached	7.4s	7.4s	-40ms
nodeModulesSize	359 MB	359 MB	⚠️ +603 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
/ failed reqs	0	0	✓
/ total time (seconds)	4.156	4.257	⚠️ +0.1
/ avg req/sec	601.6	587.3	⚠️ -14.3
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	2.008	2.031	⚠️ +0.02
/error-in-render avg req/sec	1245.23	1230.65	⚠️ -14.58

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.1 kB	42.1 kB	✓
main-HASH.js gzip	27.9 kB	27.9 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.6 kB	71.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	305 B	305 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.56 kB	2.56 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	911 B	911 B	✓
image-HASH.js gzip	5.05 kB	5.05 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.28 kB	2.28 kB	✓
routerDirect..HASH.js gzip	314 B	314 B	✓
script-HASH.js gzip	375 B	375 B	✓
withRouter-HASH.js gzip	309 B	309 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.7 kB	14.7 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js feat/copy-env-file-in-standalone	Change
index.html gzip	533 B	533 B	✓
link.html gzip	547 B	547 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.61 kB	1.61 kB	✓

Commit: c425cb7