feat(nsis): allow disabling of building a universal installer

[mmaietta]

By default, electron-builder builds a universal NSIS package when multiple archs are specified. This universal exe size is usually the sum of each individual installer.

This PR introduces a config property buildUniversalInstaller (default true for backward compatibility)
In order to build separate exe's, I needed to update the installer name template to include an arch. Unless a defaultArch is supplied, x64 will not have a suffix appended to the file name and the other arch builds will have suffix -${arch}.

electron-builder/packages/app-builder-lib/src/targets/nsis/NsisTarget.ts

Lines 140 to 146 in 1b41b17

	protected installerFilenamePattern(primaryArch?: Arch | null, defaultArch?: string): string {
	if (!this.shouldBuildUniversalInstaller()) {
	return "${productName} " + (this.isPortable ? "" : "Setup ") + "${version}" + (primaryArch != null ? getArchSuffix(primaryArch, defaultArch) : "") + ".${ext}"
	}
	// tslint:disable:no-invalid-template-strings
	return "${productName} " + (this.isPortable ? "" : "Setup ") + "${version}.${ext}"
	}

Note: Only nsis targets supports individual installers as nsis-web requires 32 bit arch to be present in the distributable package since it automatically detects OS architecture and downloads the corresponding package file. nsis-web logic overrides any setting to buildUniversalInstaller to true.
Ref: https://www.electron.build/nsis.html#web-installer

Resolves: #8298 and #8597

[changeset-bot]

🦋 Changeset detected

Latest commit: b5914a3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
app-builder-lib	Major
dmg-builder	Major
electron-builder-squirrel-windows	Major
electron-builder	Major
electron-forge-maker-appimage	Major
electron-forge-maker-nsis-web	Major
electron-forge-maker-nsis	Major
electron-forge-maker-snap	Major

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