Sign windows builds (using encrypted signing cert)

Author: pimterry

.gitignore

@@ -1,3 +1,5 @@
 node_modules
 out
-httptoolkit-server/
+httptoolkit-server/
+appveyor-tools/
+encrypted-win-certificate.pfx

appveyor.yml

@@ -15,6 +15,8 @@ branches:
   - /^v\d\.\d\.\d/
 
 install:
+- ps: iex ((New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/appveyor/secure-file/master/install.ps1'))
+- cmd: appveyor-tools\secure-file -decrypt encrypted-win-certificate.pfx.enc -secret %CERTIFICATE_FILE_KEY%
 - ps: Install-Product node $env:nodejs_version $env:platform
 - set PATH=%APPDATA%\npm;%PATH%
 - npm install

encrypted-win-certificate.pfx.enc

@@ -45,7 +45,8 @@
         "title": "HTTP Toolkit",
         "exe": "httptoolkit.exe",
         "iconUrl": "https://httptoolkit.tech/favicon.ico",
-        "setupIcon": "./src/icon.ico"
+        "setupIcon": "./src/icon.ico",
+        "certificateFile": "./encrypted-win-certificate.pfx"
       },
       "electronInstallerDMG": {
         "name": "HTTP Toolkit",