ci(all): Test format mattermost notification

.github/workflows/build_publish_compute.yml

@@ -184,7 +184,7 @@ jobs:
           echo "### Pypi package" >> /tmp/changelog.md
           echo "" >> /tmp/changelog.md
           echo "Pypi package have been built and pushed to Pypi: [ecoindex-compute:${{ needs.python_project.outputs.compute_version }}](https://pypi.org/project/ecoindex-compute/${{ needs.python_project.outputs.compute_version }}/)" >> /tmp/changelog.md
-          echo "{\"props\":{\"card\":\"$(cat /tmp/changelog.md)\"},\"text\":\"### [Compute] Nouvelle release: v${{ needs.python_project.outputs.compute_version }}\"}" > mattermost.json
+          echo "{\"icon_emoji\":\":tada:\",\"props\":{\"card\":\"$(cat /tmp/changelog.md)\"},\"text\":\"### [Compute] Nouvelle release: v${{ needs.python_project.outputs.compute_version }}\"}" > mattermost.json
 
       - name: Create Release
         uses: ncipollo/release-action@v1
@@ -199,6 +199,5 @@ jobs:
 
       - name: Notify to Mattermost
         # if: ${{ !env.PRERELEASE }}
-        uses: mattermost/action-mattermost-notify@master
-        env:
-          MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_RELEASE_URL }}
+        run: |
+          curl -X POST -H 'Content-Type: application/json' -d @mattermost.json ${{ secrets.MATTERMOST_WEBHOOK_URL }}