Add build workflow

.github/workflows/build.yml

@@ -0,0 +1,28 @@
+name: Build
+
+on:
+  push:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build
+    runs-on: ghcr.io/cirruslabs/macos-runner:tahoe
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v5
+      - name: Build
+        run: |
+          export COMPILATION_CACHE_ENABLE_CACHING=YES
+          export COMPILATION_CACHE_REMOTE_SERVICE_PATH="$HOME/.cirruslabs/omni-cache.sock"
+          export COMPILATION_CACHE_ENABLE_PLUGIN=YES
+          export COMPILATION_CACHE_ENABLE_INTEGRATED_QUERIES=YES
+          export COMPILATION_CACHE_ENABLE_DETACHED_KEY_QUERIES=YES
+          export SWIFT_ENABLE_COMPILE_CACHE=YES
+          export SWIFT_ENABLE_EXPLICIT_MODULES=YES
+          export SWIFT_USE_INTEGRATED_DRIVER=YES
+          export CLANG_ENABLE_COMPILE_CACHE=YES
+          export CLANG_ENABLE_MODULES=YES
+          swift build --build-system swiftbuild --product tart