feat: add afterPack call after macOS universal package is created (#6887)

Author: schetle

.changeset/wet-ligers-heal.md

@@ -0,0 +1,5 @@
+---
+"app-builder-lib": minor
+---
+
+add afterPack call after macOS universal package is created

packages/app-builder-lib/src/macPackager.ts

@@ -132,6 +132,18 @@ export default class MacPackager extends PlatformPackager<MacConfiguration> {
         })
         await fs.rm(x64AppOutDir, { recursive: true, force: true })
         await fs.rm(arm64AppOutPath, { recursive: true, force: true })
+
+        // Give users a final opportunity to perform things on the combined universal package before signing
+        const packContext: AfterPackContext = {
+          appOutDir,
+          outDir,
+          arch,
+          targets,
+          packager: this,
+          electronPlatformName: platformName,
+        }
+        await this.info.afterPack(packContext)
+
         await this.doSignAfterPack(outDir, appOutDir, platformName, arch, platformSpecificBuildOptions, targets)
         break
       }