Use caching and parallel for faster builds.

This also uses the Gradle Build Action to enable faster builds with
caching.
The Gradle Build Action also validates the Gradle wrapper by default

Author: runningcode

.github/workflows/android.yml

@@ -27,8 +27,8 @@ jobs:
         java-version: 17
         cache: gradle
 
-    - name: Validate Gradle Wrapper
-      uses: gradle/wrapper-validation-action@v3
+    - name: Setup Gradle and validate wrapper
+      uses: gradle/actions/setup-gradle@v4
 
     - name: Build with Gradle
       run: ./gradlew qa

.github/workflows/diffuse.yml

@@ -31,8 +31,8 @@ jobs:
     - name: Install NDK
       run: echo "y" | ${ANDROID_SDK_ROOT}/cmdline-tools/latest/bin/sdkmanager --install "ndk;${{ env.NDK_VERSION }}"
 
-    - name: Validate Gradle Wrapper
-      uses: gradle/wrapper-validation-action@v1
+    - name: Setup Gradle and validate Gradle Wrapper
+      uses: gradle/actions/setup-gradle@v4
 
     - name: Cache base apk
       id: cache-base

gradle.properties

@@ -9,6 +9,9 @@ org.gradle.configuration-cache=false
 # See: https://docs.gradle.org/current/userguide/toolchains.html#sub:disable_auto_provision
 org.gradle.java.installations.auto-download=false
 
+org.gradle.caching=true
+org.gradle.parallel=true
+
 # Uncomment these to build libsignal from source.
 # libsignalClientPath=../libsignal
 # org.gradle.dependency.verification=lenient