Automate codesign

(cherry picked from commit 0d9c815)

Makefile

@@ -114,7 +114,15 @@ clean-sparkle:
 .PHONY: package archive sign-archive
 
 package: release
+ifdef DEV_ID
+	package/sign.bash $(DEV_ID)
+endif
 	bash package/make_package
+ifdef DEV_ID
+	productsign --sign "Developer ID Installer: $(DEV_ID)" package/Squirrel.pkg package/Squirrel-signed.pkg
+	rm package/Squirrel.pkg
+	mv package/Squirrel-signed.pkg package/Squirrel.pkg
+endif
 
 archive: package
 	bash package/make_archive

package/sign.bash

@@ -0,0 +1,15 @@
+appDir="build/Release/Squirrel.app"
+
+allFiles=$(find "$appDir" -print)
+for file in $allFiles; do
+	if ! [[ -d "$file" ]]; then
+		if [[ -x "$file" ]]; then
+			echo "$file"
+			codesign --force --options runtime --timestamp --sign "Developer ID Application: $1" "$file";
+		fi;
+	fi;
+done;
+
+codesign --force --options runtime --timestamp --sign "Developer ID Application: $1" "$appDir";
+
+spctl -a -vv "$appDir";