remove existing conda envs

.github/workflows/test_notebooks.yml

@@ -1,13 +1,3 @@
-name: Test Notebooks
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
 jobs:
   test:
     runs-on: ubuntu-22.04
@@ -23,6 +13,11 @@ jobs:
           python-version: "3.11"
           auto-activate-base: false
 
+      - name: Remove existing environment (if exists)
+        shell: bash -l {0}
+        run: |
+          conda env remove --name myenv || true
+
       - name: Install dependencies and run tests
         shell: bash -l {0}
         run: |