Added scheduled builds and updated build badge to point to it. (#50)

Author: cgrindel

.github/workflows/ci.yml

@@ -3,6 +3,9 @@ name: CI for PR Merge
 on:
   pull_request:
     branches: [ main ]
+  schedule:
+    # Every day at 11:16 UTC.
+    - cron: '16 11 * * *'
 
 jobs:
   macos_build:

README.md

@@ -1,6 +1,6 @@
 # SwiftFormat Rules for Bazel
 
-[![Build](https://github.com/cgrindel/rules_swiftformat/actions/workflows/ci.yml/badge.svg)](https://github.com/cgrindel/rules_swiftformat/actions/workflows/ci.yml)
+[![Build](https://github.com/cgrindel/rules_swiftformat/actions/workflows/ci.yml/badge.svg?event=schedule)](https://github.com/cgrindel/rules_swiftformat/actions/workflows/ci.yml)
 
 This repository contains Bazel rules and macros that will format Swift source files using
 [nicklockwood/SwiftFormat](https://github.com/nicklockwood/SwiftFormat), test that the formatted