release-test.yml: return of the Matrix notification

This time keep-it-simple-style with just a cURL command, using the
[API `m.room.message`](https://spec.matrix.org/latest/client-server-api/#events-2).

.github/workflows/release-test.yml

@@ -130,6 +130,7 @@ jobs:
  sudo apt-get update
  sudo apt-get install lib32asan6
  - name: Run release tests
+ id: tests
  timeout-minutes: 350
  run: |
  RIOTBASE="$GITHUB_WORKSPACE/RIOT"
@@ -181,6 +182,25 @@ jobs:
  mkdir test-reports/
  junit2html ${REPORT_XML} ${REPORT_NAME}.html
  cp ${REPORT_XML} ${REPORT_NAME}.xml
+ - name: Generate result message
+ if: always()
+ id: generate_results
+ run: |
+ if [ "${{ steps.tests.conclusion }}" == "success" ]; then
+ nice_str="&#x2705; <strong>PASSED</strong>"
+ elif [ "${{ steps.tests.conclusion }}" == "failure" ]; then
+ nice_str="&#x274C; <strong>FAILED</strong>"
+ fi
+ echo "nice_str=${nice_str}" >> ${GITHUB_OUTPUT}
+ - name: Report to Matrix channel
+ if: ${{ always() && steps.generate_results.outputs.nice_str != '' }}
+ run: |
+ MESSAGE="${{ steps.generate_results.outputs.nice_str}}: Release tests" \
+ "[${{ matrix.pytest_mark }}, ${{ matrix.sudo }}] on '<em>${{ github.event_name }}</em>':" \
+ "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"; \
+ curl -H "Content-Type: application/json" -X POST \
+ --data '{"msgtype":"m.text","format":"org.matrix.custom.html","body":"${MESSAGE}","formatted_body":"${MESSAGE}"}' \
+ "https://matrix.org/_matrix/client/v3/rooms/${{env.RIOT_CI_RELEASE_REPORT_CHANNEL}}/send/m.room.message?access_token=${{secrets.MATRIX_RIOT_CI_ACCESS_TOKEN}}"
  - uses: actions/upload-artifact@v2
  if: always()
  with: