Overwrite test root dir on windows CI job

Adds support for the `HLS_TEST_ROOTDIR` which allows to overwrite the
location for the test case artifacts.

Author: fendor

.github/actions/setup-build/action.yml

@@ -44,6 +44,13 @@ runs:
         echo "CABAL_PKGS_DIR=C:\\cabal\\packages" >> $GITHUB_ENV
       shell: bash
 
+    - if: inputs.os == 'Windows'
+      name: (Windows) Platform config (root test directory)
+      run: |
+        mkdir C:\\hls-tests
+        echo "HLS_TEST_ROOTDIR=C:\\hls-tests" >> $GITHUB_ENV
+      shell: bash
+
     - if: ( inputs.os == 'Linux' ) || ( inputs.os == 'macOS' )
       name: (Linux,macOS) Platform config
       run: |

hls-test-utils/src/Test/Hls.hs

@@ -608,10 +608,16 @@ instance Default (TestConfig b) where
 -- However, it is totally safe to delete the directory between runs.
 setupTestEnvironment :: IO FilePath
 setupTestEnvironment = do
-  tmpDirRoot <- getTemporaryDirectory
-  let testRoot = tmpDirRoot </> "hls-tests"
-  createDirectoryIfMissing True testRoot
-  pure testRoot
+  mRootDir <- lookupEnv "HLS_TEST_ROOTDIR"
+  case mRootDir of
+    Nothing -> do
+      tmpDirRoot <- getTemporaryDirectory
+      let testRoot = tmpDirRoot </> "hls-tests"
+      createDirectoryIfMissing True testRoot
+      pure testRoot
+    Just rootDir -> do
+      createDirectoryIfMissing True rootDir
+      pure rootDir
 
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