(#109) CI: cache the downloads

Author: ForNeVeR

.github/workflows/main.yml

@@ -32,6 +32,12 @@ jobs:
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v3
 
+      - name: "Cache downloads"
+        uses: actions/cache@v4
+        with:
+          path: "build/downloads"
+          key: ${{ hashFiles('gradle.properties') }}
+
       - name: Build
         run: ./gradlew build