Add incremental builds

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

.github/workflows/nightly.yml

@@ -48,6 +48,13 @@ jobs:
         with:
           xcode-version: ${{ matrix.version }}
 
+      - name: Cache Build
+        uses: irgaly/xcode-cache@v1
+        with:
+          key: xcode-cache-deriveddata-${{ github.workflow }}-${{ github.sha }}
+          restore-keys: xcode-cache-deriveddata-${{ github.workflow }}-
+
+
       - name: Build SideStore
         run: make build | xcpretty && exit ${PIPESTATUS[0]}