e2e tests for pixi and mixed envs

Author: keewis

.github/workflows/ci.yml

@@ -65,6 +65,16 @@ jobs:
           - envs: "envs/env1.yaml"
             policy-file: policy_no_extra_options.yaml
             expected-failure: "false"
+          - envs: pixi:env1
+            manifest-path: envs/pixi.toml
+          - envs: |
+              pixi:env1
+              pixi:env2
+            manifest-path: envs/pixi.toml
+          - envs: |
+              pixi:env1
+              conda:envs/env2.yaml
+            manifest-path: envs/pixi.toml
 
     steps:
       - name: clone the repository

envs/pixi.toml

@@ -0,0 +1,14 @@
+[dependencies]
+numpy = "1.24"
+pandas = "2.1"
+packaging = "23.1"
+
+[feature.py310.dependencies]
+python = "3.10"
+
+[feature.py311.dependencies]
+python = "3.11"
+
+[environments]
+env1 = { features = ["py310"] }
+env2 = ["py311"]