Fix coverage reporting in CI

.github/workflows/main.yml

@@ -50,6 +50,13 @@ jobs:
         run: |
           npm ci
           npm run test
+      - run: tar -cvf coverage_unit.tar coverage_unit
+      - name: Store coverage report
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage_unit
+          path: coverage_unit.tar
+          retention-days: 1
 
   e2e-test:
     runs-on: ubuntu-latest
@@ -76,6 +83,39 @@ jobs:
         run: |
           npm ci
           NODE_OPTIONS="--max-old-space-size=4096" npm run e2e
+      - run: tar -cvf coverage_e2e.tar coverage_e2e
+      - name: Store coverage report
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage_e2e
+          path: coverage_e2e.tar
+          retention-days: 1
+
+  coverage:
+    needs: [unit-test, e2e-test]
+    runs-on: ubuntu-latest
+    env:
+      cache-name: cache-node-modules
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Cache node modules
+        uses: actions/cache@v3
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+      - uses: actions/download-artifact@v3
+        with:
+          name: coverage_unit
+      - uses: actions/download-artifact@v3
+        with:
+          name: coverage_e2e
+      - run: tar -xvf coverage_unit.tar && rm coverage_unit.tar
+      - run: tar -xvf coverage_e2e.tar && rm coverage_e2e.tar
       - name: Coverage
         uses: codecov/codecov-action@v3
         with: