Nightly runs on 3.6/stable (#366)

Author: MiaAltieri

.github/workflows/ci.yaml

@@ -73,7 +73,7 @@ jobs:
           - agent: 3.5.3 # renovate: juju-agent-pin-minor
             allure_report: true
           # This runs only on scheduled runs, DPW 21 specifics (scheduled + 3.6/X)
-          - snap_channel: 3.6/beta
+          - snap_channel: 3.6/stable
             allure_report: false
     name: Integration test charm | ${{ matrix.juju.agent || matrix.juju.snap_channel }}
     needs: