feat(ci): cache gradle

Author: NKID00

.github/workflows/build.yml

@@ -1,6 +1,6 @@
 name: build
 
-on: [push, pull_request]
+on: [push, pull_request, workflow_dispatch]
 
 jobs:
   build:
@@ -13,6 +13,7 @@ jobs:
         with:
           distribution: temurin
           java-version: 21
+          cache: gradle
       - name: Validate gradle wrapper
         uses: gradle/actions/wrapper-validation@v4
       - name: Build