Update stable.yml

Signed-off-by: June Park <me@pythonplayer123.dev>

.github/workflows/stable.yml

@@ -3,6 +3,7 @@ on:
   push:
     tags:
       - '[0-9]+.[0-9]+.[0-9]+' # example: 1.0.0
+  workflow_dispatch:
 
 jobs:
   build:
@@ -44,6 +45,9 @@ jobs:
         with:
           key: xcode-cache-deriveddata-${{ github.sha }}
           restore-keys: xcode-cache-deriveddata-
+          swiftpm-cache-key: xcode-cache-sourcedata-${{ github.sha }}
+          swiftpm-cache-restore-keys: |
+            xcode-cache-sourcedata-
 
       - name: Build SideStore
         run: NSUnbufferedIO=YES make build | xcbeautify --renderer github-actions && exit ${PIPESTATUS[0]}