project: add codecoverage step in ci

Author: twittemb

.github/workflows/ci.yml

@@ -3,13 +3,29 @@ name: Build and test
 on: [push]
 
 jobs:
-  build:
+  Build:
 
     runs-on: macos-12
 
     steps:
-      - uses: actions/checkout@v3
+      - name: Checkout branch
+        uses: actions/checkout@v3
       - name: Build
         run: swift build
-      - name: Run tests
-        run: swift test
+
+  Test:
+
+    runs-on: macos-12
+
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v3
+      - name: Test
+        run: swift test --enable-code-coverage
+      - name: Generate coverage
+        uses: sersoft-gmbh/swift-coverage-action@v3
+        id: coverage-files
+      - name: Upload coverage
+        uses: codecov/codecov-action@v3
+        with:
+          files: ${{join(fromJSON(steps.coverage-files.outputs.files), ',')}}

README.md

@@ -1,5 +1,6 @@
 [![Build and test](https://github.com/sideeffect-io/AsyncStateMachine/actions/workflows/ci.yml/badge.svg)](https://github.com/sideeffect-io/AsyncStateMachine/actions/workflows/ci.yml)
 [![Lint](https://github.com/sideeffect-io/AsyncStateMachine/actions/workflows/lint.yml/badge.svg)](https://github.com/sideeffect-io/AsyncStateMachine/actions/workflows/lint.yml)
+[![Codecov](https://codecov.io/gh/sideeffect-io/AsyncStateMachine/branch/main/graph/badge.svg?token=CRAZF1LOM9)](https://codecov.io/gh/sideeffect-io/AsyncStateMachine)
 
 # Async State Machine
 **Async State Machine** aims to provide a way to structure an application thanks to state machines. The goal is to identify the states and the side effects involved in each feature and to model them in a consistent and scalable way thanks to a DSL.