Add codecov

Author: ohno

.github/workflows/CI.yml

@@ -37,6 +37,12 @@ jobs:
       - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v4
+        with:
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: false
   docs:
     name: Documentation
     runs-on: ubuntu-latest
@@ -45,7 +51,7 @@ jobs:
       contents: write
       statuses: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1'

README.md

@@ -3,6 +3,7 @@
 [![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaFewBody.github.io/MetropolisAlgorithm.jl/stable/)
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://JuliaFewBody.github.io/MetropolisAlgorithm.jl/dev/)
 [![Build Status](https://github.com/JuliaFewBody/MetropolisAlgorithm.jl/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/JuliaFewBody/MetropolisAlgorithm.jl/actions/workflows/CI.yml?query=branch%3Amain)
+[![Coverage](https://codecov.io/gh/JuliaFewBody/MetropolisAlgorithm.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/JuliaFewBody/MetropolisAlgorithm.jl)
 
 ## Documentation