MAINT: Add clear-cache job

.github/workflows/test.yml

@@ -14,9 +14,39 @@ env:
   PIXI_VERSION: "v0.63.0"
 
 jobs:
-  # TODO: Add a job that clears the GitHub cache
+  clear-cache:
+    runs-on: ubuntu-slim
+    permissions:
+      actions: write
+    steps:
+      - name: Clear pixi-lock cache entries
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          echo "Clearing pixi-lock-* cache entries"
+          gh cache list --repo ${{ github.repository }} --json key --jq '.[].key' | grep '^pixi-lock_' | while read -r key; do
+            echo "Deleting cache: $key"
+            for attempt in 1 2 3; do
+              if gh cache delete "$key" --repo ${{ github.repository }}; then
+                break
+              fi
+              echo "Attempt $attempt failed, retrying in 5 seconds..."
+              sleep 5
+            done
+          done
+          sleep 5
+          echo "Verifying all caches are cleared..."
+          remaining=$(gh cache list --repo ${{ github.repository }} --json key --jq '.[].key' | grep '^pixi-lock_' || true)
+          if [ -n "$remaining" ]; then
+            echo "Error: Some caches still exist:"
+            echo "$remaining"
+            exit 1
+          fi
+          echo "Cache cleared"
+
   cache-pixi-lock:
-    runs-on: ubuntu-latest
+    needs: clear-cache
+    runs-on: ubuntu-slim
     outputs:
       cache-key: ${{ steps.create-and-cache.outputs.cache-key }}
       pixi-version: ${{ steps.create-and-cache.outputs.pixi-version }}
@@ -52,7 +82,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-slim, macos-latest, windows-latest]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6