Submit coverage reports to codecov and add badge (#203)

Author: timholy

.github/workflows/CI.yml

@@ -67,6 +67,10 @@ jobs:
             ${{ runner.os }}-
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@latest
+      - uses: codecov/codecov-action@v3
+        with:
+          file: lcov.info
   test_sysimage:
     name: JuliaSyntax sysimage build - ${{ github.event_name }}
     runs-on: ubuntu-latest

.gitignore

@@ -1,3 +1,4 @@
 /Manifest.toml
 /tools/pkgs
-/tools/logs.txt
+/tools/logs.txt
+*.cov

README.md

@@ -1,6 +1,7 @@
 # JuliaSyntax
 
 [![Build Status](https://github.com/c42f/JuliaSyntax.jl/workflows/CI/badge.svg)](https://github.com/c42f/JuliaSyntax.jl/actions)
+[![codecov.io](http://codecov.io/github/JuliaLang/JuliaSyntax.jl/coverage.svg?branch=main)](http://codecov.io/github/JuliaLang/JuliaSyntax.jl?branch=main)
 
 A Julia frontend, written in Julia.
 
@@ -483,7 +484,7 @@ The same goes for command strings which are always wrapped in `K"cmdstring"`
 regardless of whether they have multiple pieces (due to triple-quoted
 dedenting) or otherwise.
 
-### No desugaring of the closure in do blocks 
+### No desugaring of the closure in do blocks
 
 The reference parser represents `do` syntax with a closure for the second
 argument. That is,