Fix missing env.

Author: Juan Tirado

.github/workflows/test.yaml

@@ -17,8 +17,8 @@ jobs:
       uses: actions/checkout@v3
     - name: Prepare environment
       shell: bash
-      with: 
-        juju-channel: "3.0/stable"
+      env: 
+        JUJU_CHANNEL: "3.0/stable"
       run: |
         sudo mkdir -p ~/.config
         sudo chown -R $USER:$USER ~/.config