ci: only install the required environment

Author: cpcloud

.github/workflows/conda-python-tests.yaml

@@ -111,8 +111,16 @@ jobs:
       - name: Setup proxy cache
         uses: nv-gha-runners/setup-proxy-cache@main
         continue-on-error: true
+
+      - name: Compute pixi environment name
+        run: |
+          set -euo pipefail
+          PIXI_ENV="cu-$(cut -d. -f1-2 <<< "${{ matrix.CUDA_VER }}" | tr . -)"
+          echo "PIXI_ENV=${PIXI_ENV}" >> "${GITHUB_ENV}"
       - name: Setup pixi
         uses: prefix-dev/[email protected]
+        with:
+          environments: ${{ env.PIXI_ENV }}
       - name: Python tests
         run: ${{ inputs.script }}
         env:

ci/test_conda.sh

@@ -25,8 +25,6 @@ EXITCODE=0
 trap "EXITCODE=1" ERR
 set +e
 
-PIXI_ENV="cu-$(cut -d. -f1-2 <<< "${CUDA_VER}" | tr . -)"
-
 rapids-logger "Show dependencies"
 pixi list -e "${PIXI_ENV}"