.github/workflows/backend-test: Add coverage html report

As an artifact, and link to the artifact to view in the browser.

Signed-off-by: René Dudfield <renedudfield@microsoft.com>

.github/workflows/backend-test.yml

@@ -64,6 +64,7 @@ jobs:
  set -x
  cd backend
  go test ./... -coverprofile=coverage.out -covermode=atomic -coverpkg=./...
+ go tool cover -html=coverage.out -o backend_coverage.html
  testcoverage_full=$(go tool cover -func=coverage.out)
  testcoverage=$(go tool cover -func=coverage.out | grep total | grep -Eo '[0-9]+\.[0-9]+')
  testcoverage_full_base64=$(echo "$testcoverage_full" | base64 -w 0)
@@ -75,6 +76,19 @@ jobs:
  rm ~/.config/Headlamp/kubeconfigs/config
  shell: bash
 
+ - name: Upload coverage report as artifact
+ uses: actions/upload-artifact@v3
+ with:
+ name: backend-coverage-report
+ path: ./backend/backend_coverage.html
+
+ - name: Get backend_coverage artifact URL
+ id: get-artifact-url
+ run: |
+ ARTIFACT_ID=$(gh api -H "Accept: application/vnd.github.v3+json" /repos/${{ github.repository }}/actions/artifacts | jq -r '.artifacts[] | select(.name=="backend-coverage-report") | .id')
+ ARTIFACT_URL="https://github.com/${{ github.repository }}/suites/${{ github.run_id }}/artifacts/$ARTIFACT_ID"
+ echo "artifact_url=$ARTIFACT_URL" >> $GITHUB_ENV
+
  - name: Get base branch code coverage
  if: ${{ github.event_name }} == 'pull_request'
  run: |
@@ -134,6 +148,7 @@ jobs:
 
  base_coverage="${{ env.base_coverage }}"
  coverage_diff="${{ env.coverage_diff }}"
+ artifact_url="${{ env.artifact_url }}"
 
  if (( $(echo "$coverage_diff < 0" | bc -l) )); then
  emoji="😞" # Decreased coverage
@@ -148,13 +163,16 @@ jobs:
  comment="${comment}
 
  <details>
- <summary>See full coverage report</summary>
+ <summary>Coverage report</summary>
 
  \`\`\`
  $testcoverage_full
  \`\`\`
 
- </details>"
+ </details>
+
+ [Html coverage report download](artifact_url)
+ "
 
  echo "$comment"