Fix GitHub action for publishing

Author: simw

.github/workflows/test.yml

@@ -5,6 +5,9 @@ on: [push, pull_request]
 permissions:
   contents: read
 
+env:
+  UV_VERSION: "0.5.1"
+
 jobs:
 
   lint:
@@ -20,7 +23,7 @@ jobs:
     - name: Install uv
       uses: astral-sh/setup-uv@v3
       with:
-        version: "0.5.1"
+        version: "$UV_VERSION"
 
     - name: Lint
       run: make lint
@@ -42,7 +45,7 @@ jobs:
     - name: Install uv
       uses: astral-sh/setup-uv@v3
       with:
-        version: "0.5.1"
+        version: "$UV_VERSION"
 
     - name: Run tests
       run: make test