Fix issue with windows CI

.github/workflows/ci.yml

@@ -296,6 +296,17 @@ jobs:
         with:
           tool: cargo-nextest,cargo-llvm-cov
 
+        # Cache step must go before warp and mesa install on windows as they write into the
+        # target directory, and rust-cache will overwrite the entirety of the target directory.
+      - name: caching
+        uses: Swatinem/rust-cache@v2
+        if: matrix.os[0] != 'self-hosted'
+        with:
+          key: test-${{ matrix.os }}-${{ env.CACHE_SUFFIX }}
+          workspaces: |
+            . -> target
+            xtask -> xtask/target
+
       - name: (windows) install warp
         if: matrix.os == 'windows-2022'
         shell: bash
@@ -350,15 +361,6 @@ jobs:
           [profile.dev]
           debug = 1" >> .cargo/config.toml
 
-      - name: caching
-        uses: Swatinem/rust-cache@v2
-        if: matrix.os[0] != 'self-hosted'
-        with:
-          key: test-${{ matrix.os }}-${{ env.CACHE_SUFFIX }}
-          workspaces: |
-            . -> target
-            xtask -> xtask/target
-
       - name: run wgpu-info
         shell: bash
         run: |