Fix CI: trigger on all branches, add Tests badge

- Remove branch filter on push so CI runs on all branches, not just main
- Add separate Lint and Tests badges to README
- Tests badge uses shields.io for proper rendering

Author: danielandresarcones

.github/workflows/ci.yml

@@ -2,7 +2,6 @@ name: CI
 
 on:
   push:
-    branches: [main]
   pull_request:
     branches: [main]
 

README.md

@@ -1,6 +1,7 @@
 # pyBASTION
 
-[![CI](https://github.com/danielandresarcones/pybastion/actions/workflows/ci.yml/badge.svg)](https://github.com/danielandresarcones/pybastion/actions/workflows/ci.yml)
+[![Lint](https://github.com/danielandresarcones/pybastion/actions/workflows/ci.yml/badge.svg?event=push)](https://github.com/danielandresarcones/pybastion/actions/workflows/ci.yml)
+[![Tests](https://img.shields.io/github/actions/workflow/status/danielandresarcones/pybastion/ci.yml?label=tests)](https://github.com/danielandresarcones/pybastion/actions/workflows/ci.yml)
 [![Python 3.9+](https://img.shields.io/badge/python-3.9%2B-blue.svg)](https://www.python.org/downloads/)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Imports: isort](https://img.shields.io/badge/%20imports-isort-%231674b1?style=flat&labelColor=ef8336)](https://pycqa.github.io/isort/)