and now without the quotes

.github/workflows/test.yaml

@@ -4,6 +4,7 @@ name: test
 
 on: [push, pull_request]
 
+# Gave up -- could not figure out how to use environment variables :-(
 env:
   # I got these from: https://github.com/prefix-dev/setup-pixi/blob/main/README.md
   # they seem to keep it pretty up to date
@@ -20,9 +21,9 @@ jobs:
         environment: [test310, test311, test312]
     steps:
       - uses: actions/checkout@v4
-      - uses: "prefix-dev/setup-pixi@$SETUP_PIXI_VERSION"
+      - uses: prefix-dev/setup-pixi@$SETUP_PIXI_VERSION
         with:
-          pixi-version: "$env.PIXI_VERSION"
+          pixi-version: $env.PIXI_VERSION
           cache: true
           # auth-host: prefix.dev
           # auth-token: ${{ secrets.PREFIX_DEV_TOKEN }}
@@ -34,7 +35,7 @@ jobs:
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
-      - uses: "prefix-dev/setup-pixi@$SETUP_PIXI_VERSION"
+      - uses: prefix-dev/setup-pixi@$SETUP_PIXI_VERSION
         with:
           pixi-version: $PIXI_VERSION
           cache: true