Show backend coverage as PR comment

.github/workflows/backend.yml

@@ -12,6 +12,7 @@ on:
 
 permissions:
   contents: read
+  pull-requests: write
 
 jobs:
   lint-backend:
@@ -49,4 +50,18 @@ jobs:
           python -m pip install -r requirements.txt -r requirements-test.txt
       - name: Pytest
         timeout-minutes: 5
-        run: python -m pytest
+        run: python -m pytest --cov-report term > report.txt
+      - name: Coverage
+        shell: bash
+        run: |
+          gh api \
+            --method POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            /repos/${REPOSITORY_OWNER}/${REPOSITORY_NAME}/issues/${PULL_REQUEST_NUMBER}/comments \
+            -f "body=`cat report.txt`"
+        env:
+          GH_TOKEN: ${{ github.token }}
+          REPOSITORY_OWNER: ${{ github.repository_owner }}
+          REPOSITORY_NAME: ${{ github.event.repository.name }}
+          PULL_REQUEST_NUMBER: ${{ github.event.number }}