feat(msi): build emulated arm64 MSI installers (#8086)

Build x64 MSI installers when targeting the arm64 architecture. This
results in an x64 MSI installer that installs an arm64 version of the
application.

An x64 MSI installer is an improvement because building arm64 MSI
targets errors with:
```
error CNDL0264 : The parameter 'arch' is missing or has an invalid value arm64.
Possible values are x86, x64, or ia64.
```

This is a stopgap until the electron-builder-binaries wix version is upgraded
to a version that supports arm64 which is currently blocked by a number of
breaking changes between 4.0.0.5512.2 and 4.0.1. This upgrade is
discussed in #6077.

.changeset/chatty-dolphins-poke.md

@@ -0,0 +1,5 @@
+---
+"app-builder-lib": minor
+---
+
+feat(msi): build emulated arm64 MSI installers

packages/app-builder-lib/src/targets/MsiTarget.ts

@@ -75,17 +75,23 @@ export default class MsiTarget extends Target {
 
     const commonOptions = getEffectiveOptions(this.options, this.packager)
 
+    // wix 4.0.0.5512.2 doesn't support the arm64 architecture so default to x64 when building for arm64.
+    // This will result in an x64 MSI installer that installs an arm64 version of the application. This is a
+    // stopgap until the electron-builder-binaries wix version is upgraded to a version that supports arm64:
+    // https://github.com/electron-userland/electron-builder/issues/6077
+    const wixArch = arch == Arch.arm64 ? Arch.x64 : arch;
+
     const projectFile = stageDir.getTempFile("project.wxs")
     const objectFiles = ["project.wixobj"]
-    await writeFile(projectFile, await this.writeManifest(appOutDir, arch, commonOptions))
+    await writeFile(projectFile, await this.writeManifest(appOutDir, wixArch, commonOptions))
 
     await packager.info.callMsiProjectCreated(projectFile)
 
     // noinspection SpellCheckingInspection
     const vendorPath = await getBinFromUrl("wix", "4.0.0.5512.2", "/X5poahdCc3199Vt6AP7gluTlT1nxi9cbbHhZhCMEu+ngyP1LiBMn+oZX7QAZVaKeBMc2SjVp7fJqNLqsUnPNQ==")
 
     // noinspection SpellCheckingInspection
-    const candleArgs = ["-arch", arch === Arch.ia32 ? "x86" : arch === Arch.arm64 ? "arm64" : "x64", `-dappDir=${vm.toVmFile(appOutDir)}`].concat(this.getCommonWixArgs())
+    const candleArgs = ["-arch", wixArch === Arch.ia32 ? "x86" : "x64", `-dappDir=${vm.toVmFile(appOutDir)}`].concat(this.getCommonWixArgs())
     candleArgs.push("project.wxs")
     await vm.exec(vm.toVmFile(path.join(vendorPath, "candle.exe")), candleArgs, {
       cwd: stageDir.dir,
@@ -150,7 +156,7 @@ export default class MsiTarget extends Target {
     return args
   }
 
-  protected async writeManifest(appOutDir: string, arch: Arch, commonOptions: FinalCommonWindowsInstallerOptions) {
+  protected async writeManifest(appOutDir: string, wixArch: Arch, commonOptions: FinalCommonWindowsInstallerOptions) {
     const appInfo = this.packager.appInfo
     const { files, dirs } = await this.computeFileDeclaration(appOutDir)
     const options = this.options
@@ -160,7 +166,7 @@ export default class MsiTarget extends Target {
       isCreateDesktopShortcut: commonOptions.isCreateDesktopShortcut !== DesktopShortcutCreationPolicy.NEVER,
       isRunAfterFinish: options.runAfterFinish !== false,
       // https://stackoverflow.com/questions/1929038/compilation-error-ice80-the-64bitcomponent-uses-32bitdirectory
-      programFilesId: arch === Arch.x64 ? "ProgramFiles64Folder" : "ProgramFilesFolder",
+      programFilesId: wixArch === Arch.x64 ? "ProgramFiles64Folder" : "ProgramFilesFolder",
       // wix in the name because special wix format can be used in the name
       installationDirectoryWixName: getWindowsInstallationDirName(appInfo, commonOptions.isAssisted || commonOptions.isPerMachine === true),
       dirs,