Split build workflows

.github/workflows/build-cached.yml

@@ -1,14 +1,14 @@
-name: Build
+name: Build (Cached)
 
 on:
-  push:
+  workflow_dispatch:
 
 permissions:
   contents: read
 
 jobs:
   build:
-    name: Build
+    name: Build tart (cached)
     runs-on: ghcr.io/cirruslabs/macos-runner:tahoe
     timeout-minutes: 30
     steps:

.github/workflows/build-no-cache.yml

@@ -0,0 +1,17 @@
+name: Build (No Cache)
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build tart (no cache)
+    runs-on: ghcr.io/cirruslabs/macos-runner:tahoe
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v5
+      - name: Build
+        run: swift build --build-system swiftbuild --product tart