add back the cache

Author: keewis

.github/workflows/ci-additional.yml

@@ -31,6 +31,7 @@ jobs:
       - name: setup environment
         uses: prefix-dev/setup-pixi@8ca4608ef7f4daeb54f5205b20d0b7cb42f11143 # 0.8.14
         with:
+          cache: true
           environments: "doctests"
 
       - name: import pint-xarray

.github/workflows/ci.yml

@@ -63,6 +63,7 @@ jobs:
       - name: setup environment
         uses: prefix-dev/setup-pixi@8ca4608ef7f4daeb54f5205b20d0b7cb42f11143 # 0.8.14
         with:
+          cache: true
           environments: "${{ matrix.env }}"
 
       - name: import pint-xarray