Add very basic KRC build script, probably won't work yet

Author: csaluski

.github/workflows/macos_builds.yaml

@@ -0,0 +1,11 @@
+name: Test action
+on: [push]
+jobs:
+    test_action:
+        strategy:
+            matrix:
+                platform: [macos-14, macos-15, macos-15-intel, macos-26]
+        runs-on: ${{ matrix.platform }}
+        steps:
+            - uses: actions/checkout@v6
+            - run: make krc