Add code coverage using coveralls and tarpaulin (#413)

.github/workflows/build_and_test.yml

@@ -13,6 +13,7 @@ jobs:
   rust:
 
     runs-on: ubuntu-latest
+    environment: CI
 
     steps:
     - uses: actions/checkout@v3
@@ -31,7 +32,7 @@ jobs:
         npm run start &
       working-directory: ./server
     - uses: Swatinem/rust-cache@v2
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
+    - name: Build, Test and Publish Coverage
+      run: |
+        cargo install cargo-tarpaulin
+        cargo tarpaulin --all-features --verbose --skip-clean --coveralls ${{ secrets.COVERALLS_REPO_TOKEN }} --timeout 120

README.md

@@ -2,6 +2,7 @@
 
 [![Discord]][Discord-invite]
 [![Build][build-shield]][build-url]
+[![Coverage][coverage-shield]][coverage-url]
 [![Contributors][contributors-shield]][contributors-url]
 [![Forks][forks-shield]][forks-url]
 [![Issues][issues-shield]][issues-url]
@@ -124,6 +125,8 @@ accepted, if it violates these guidelines or [our Code of Conduct](https://githu
   [clippy-url]: https://github.com/polyphony-chat/chorus/blob/main/.github/workflows/clippy.yml
   [contributors-shield]: https://img.shields.io/github/contributors/polyphony-chat/chorus.svg?style=flat
   [contributors-url]: https://github.com/polyphony-chat/chorus/graphs/contributors
+  [coverage-shield]: https://coveralls.io/repos/github/polyphony-chat/chorus/badge.svg?branch=main
+  [coverage-url]: https://coveralls.io/github/polyphony-chat/chorus?branch=main
   [forks-shield]: https://img.shields.io/github/forks/polyphony-chat/chorus.svg?style=flat
   [forks-url]: https://github.com/polyphony-chat/chorus/network/members
   [stars-shield]: https://img.shields.io/github/stars/polyphony-chat/chorus.svg?style=flat