fix ci run for develop branch, also fixes test badge (#556)

.github/workflows/lint.yml

@@ -3,7 +3,7 @@ name: Linting
 on:
   push:
     branches:
-      - main
+      - develop
   pull_request:
 
 jobs:

.github/workflows/tests.yml

@@ -3,7 +3,7 @@ name: Tests
 on:
   push:
     branches:
-      - main
+      - develop
   pull_request:
 
 jobs:

README.md

@@ -3,7 +3,7 @@
 #
 
 [![Goreport status](https://goreportcard.com/badge/github.com/flashbots/mev-boost)](https://goreportcard.com/report/github.com/flashbots/mev-boost)
-[![Test status](https://github.com/flashbots/mev-boost/workflows/Tests/badge.svg)](https://github.com/flashbots/mev-boost/actions?query=workflow%3A%22Tests%22)
+[![Test status](https://github.com/flashbots/mev-boost/workflows/Tests/badge.svg?branch=develop)](https://github.com/flashbots/mev-boost/actions?query=workflow%3A%22Tests%22)
 [![Docker hub](https://badgen.net/docker/size/flashbots/mev-boost?icon=docker&label=image)](https://hub.docker.com/r/flashbots/mev-boost/tags)
 
 ## What is MEV-Boost?