ci(gha): add windows to CI

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

.github/workflows/unit-tests.yml

@@ -27,7 +27,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         rust: [1.71.0, stable, beta, nightly]
 
     steps: