docs: adjust badge

run the test ci against main to have the latest badge

Author: janz93

.github/workflows/pr_action.yml

@@ -3,6 +3,9 @@ name: All checks for a PR
 on:
   pull_request:
     branches: ["**"]
+  push:
+    branches:
+      - main
 
 jobs:
   linter:

README.md

@@ -1,6 +1,6 @@
 # Epics::Box
 
-![pull_request_ci](https://github.com/railslove/ebicsbox/actions/workflows/rspec.yml/badge.svg)
+![CI](https://github.com/railslove/ebicsbox/actions/workflows/pr_action.yml/badge.svg?branch=main)
 
 Epics Box is a self-contained solution to handle SEPA credit/debits and bank statement
 reconciliation.