Install zstd before restoring cache on windows-11-arm to get same cache version

Author: Vampire

.github/workflows/test.main.kts

@@ -236,6 +236,15 @@ workflowWithCopyright(
         runsOn = RunnerType.Custom(expr("matrix.environment")),
         _customArguments = _customArguments
     ) {
+        // work-around for https://github.com/actions/cache/issues/1622
+        // and https://github.com/actions/partner-runner-images/issues/99
+        run(
+            name = "Install zstd on windows-11-arm",
+            shell = Cmd,
+            command = "choco install zstandard",
+            condition = "matrix.environment == 'windows-11-arm'"
+        )
+
         uses(
             name = "Restore built artifacts from cache",
             action = CacheRestore(