chore: decouple unit tests and upload to codecov (#103)

Signed-off-by: Charles-Edouard Brétéché <[email protected]>

.github/workflows/codecov.yaml

@@ -9,7 +9,7 @@ on:
       - '*'
 
 jobs:
-  codecov:
+  unit-tests:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -19,9 +19,26 @@ jobs:
         uses: actions/setup-go@v5
       - name: Run coverage
         run: go test ./... -cover -coverpkg ./... -race -coverprofile=coverage.out -covermode=atomic
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+      - name: Upload coverage
+        uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4.4.0
         with:
-          files: ./coverage.out
-          fail_ci_if_error: true
-          verbose: true
+          name: coverage.out
+          path: coverage.out
+          retention-days: 1
+          if-no-files-found: error
+
+  upload-to-codecov:
+    needs:
+      - unit-tests
+    runs-on: ubuntu-latest
+    steps:
+    - name: Download coverage
+      uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
+      with:
+        name: coverage.out
+    - name: Upload Report to Codecov
+      uses: codecov/codecov-action@e28ff129e5465c2c0dcc6f003fc735cb6ae0c673 # v4.5.0
+      with:
+        files: ./coverage.out
+        fail_ci_if_error: true
+        verbose: true