Add backtrace info to CI

Author: GuillaumeGomez

.github/workflows/ci.yml

@@ -187,6 +187,7 @@ jobs:
         env:
           AWS_ACCESS_KEY_ID: ${{ env.CACHES_AWS_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets[format('AWS_SECRET_ACCESS_KEY_{0}', env.CACHES_AWS_ACCESS_KEY_ID)] }}
+          RUST_BACKTRACE: full
 
       - name: create github artifacts
         run: src/ci/scripts/create-doc-artifacts.sh