CI: set TEST_DIR when using cross

This should fix a GitHub Actions failure.

Author: andreacorbellini

.github/workflows/ci.yml

@@ -122,6 +122,7 @@ jobs:
           cargo install cross --locked --git https://github.com/cross-rs/cross
       - name: Test
         run: |
+          export TEST_DIR=$RUNNER_TEMP
           cross test --target=${{ matrix.target }} --release --verbose
 
   cross-build:

Cross.toml

@@ -0,0 +1,5 @@
+[build.env]
+passthrough = [
+    "TEST_DIR",
+    "TEST_DIR_SUPPORTS_UNNAMED",
+]