fix: inject env from envelope for ntl deploy --build

[Skn0tt]

Addresses https://linear.app/netlify/issue/COM-207/inject-env-vars-from-envelope-on-ntl-deploy-build.

We were fetching env vars from Envelope for ntl build, but not for ntl deploy --build. This PR also adds the env var injection logic to ntl deploy --build.

[github-actions]

📊 Benchmark results

Comparing with 55ff33e

• Dependency count: 1,398 (no change)
• Package size: 404 MB (no change)
• Number of ts-expect-error directives: 0 (no change)

[Skn0tt]

ha, I should've tested this out locally before working on the PR. it looks like it was indeed already working before? will investigate, turning this to draft

[Skn0tt]

oh, we're doing that here, @netlify/config is dealing with this for us!

cli/src/commands/base-command.ts

Lines 599 to 608 in 55ff33e

	const cachedConfig = await actionCommand.getConfig({
	cwd: flags.cwd ? this.workingDir : this.jsWorkspaceRoot || this.workingDir,
	repositoryRoot: rootDir,
	packagePath: this.workspacePackage,
	// The config flag needs to be resolved from the actual process working directory
	configFilePath: packageConfig,
	state,
	token,
	...apiUrlOpts,
	})

forget about this PR, then :D