[actions] Add ability to annotate ignored failures

.github/workflows/linux.yml

@@ -178,6 +178,7 @@ jobs:
 
     - name: Measure coverage
       if: ${{ matrix.build-type == 'Coverage' }}
+      id: measure-coverage
       continue-on-error: true
       timeout-minutes: 5
       run: |
@@ -205,6 +206,13 @@ jobs:
             cmake --build /root/parts/multipass/build --target covreport
         bash <(curl -s https://codecov.io/bash) -Z -s ${{ steps.coverage-setup.outputs.build }}
 
+    - uses: mainmatter/continue-on-error-comment@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        outcome: ${{ steps.measure-coverage.outcome }}
+        test-id: Error with ${{ steps.measure-coverage.name }} step in ${{ matrix.build-type }} build
+        bot-user: multipass-ci-bot
+
     - name: Build and verify the snap
       id: build-snap
       if: ${{ matrix.build-type == 'Release' }}