Enable Drone CI cache (#424)

## What changes were proposed in this pull request?

 Enable Drone CI cache.

## How was this patch tested?

CI/CD.

Reviewed-on: #424
Co-authored-by: Amab <juanmi1982@gmail.com>
Co-committed-by: Amab <juanmi1982@gmail.com>

.drone.yml

@@ -1,7 +1,19 @@
 kind: pipeline
+type: docker
 name: default
 
 steps:
+  - name: restore-cache
+    image: drillster/drone-volume-cache
+    settings:
+      restore: true
+      mount:
+        - .gradle/caches
+        - .gradle/wrapper
+    volumes:
+      - name: cache
+        path: /cache
+
   - name: fetch-tags
     image: drone/git:latest
     commands:
@@ -10,6 +22,8 @@ steps:
   - name: build & test
     image: git.cuernodehipnos.es/marown/android-sdk-docker:latest
     privileged: true
+    environment:
+      GRADLE_USER_HOME: /drone/src/.gradle
     commands:
       # Create and run emulator
       - echo "no" | avdmanager --verbose create avd --force --name "generic_34" --package "system-images;android-34;google_apis;x86_64" --tag "google_apis" --abi "x86_64"
@@ -26,3 +40,19 @@ steps:
 #        from_secret: sonar_host
 #      sonar_token:
 #        from_secret: sonar_token
+
+  - name: rebuild-cache
+    image: drillster/drone-volume-cache
+    settings:
+      rebuild: true
+      mount:
+        - .gradle/caches
+        - .gradle/wrapper
+    volumes:
+      - name: cache
+        path: /cache
+
+volumes:
+  - name: cache
+    host:
+      path: /share/CACHEDEV1_DATA/homes/admin/drone/cache