Adds test coverage reports to PR comments

This will help us visualise the amount of coverage we have on the repo on every PR.

.github/workflows/unit-test-coverage-report.yml

@@ -0,0 +1,29 @@
+name: 'Unit test coverage report'
+on:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    permissions:
+      # Required to checkout the code
+      contents: read
+      # Required to put a comment into the pull-request
+      pull-requests: write
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: 'Install Node'
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20.x'
+    - name: 'Install Deps'
+      run: npm install
+    - name: 'Run test'
+      run: npm run test:unit:coverage
+    - name: 'Report Coverage'
+      # Set if: always() to also generate the report if tests are failing
+      # Only works if you set `reportOnFailure: true` in your vite config as specified above
+      if: always()
+      uses:  davelosert/vitest-coverage-report-action@v2