ci: add Gradle and Loom caching for faster builds

Author: mishl-dev

.github/workflows/build.yml

@@ -19,9 +19,22 @@ jobs:
       with:
         java-version: '21'
         distribution: 'temurin'
+        cache: 'gradle'
 
+    - name: Cache Minecraft/Loom
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.gradle/caches/fabric-loom
+          ~/.gradle/loom-cache
+        key: ${{ runner.os }}-loom-${{ hashFiles('**/gradle.properties') }}
+        restore-keys: |
+          ${{ runner.os }}-loom-
+
     - name: Setup Gradle
       uses: gradle/actions/setup-gradle@v3
+      with:
+        cache-read-only: false
 
     - name: Make gradlew executable
       run: chmod +x ./gradlew