update circleci config

Author: adamint

.circleci/config.yml

@@ -1,11 +1,43 @@
+# Java Gradle CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-java/ for more details
+#
 version: 2
 jobs:
   build:
-    working_directory: ~/spotify-web-api-kotlin
     docker:
-      - image: gradle
+      # specify the version you desire here
+      - image: circleci/openjdk:8-jdk
+
+      # Specify service dependencies here if necessary
+      # CircleCI maintains a library of pre-built images
+      # documented at https://circleci.com/docs/2.0/circleci-images/
+      # - image: circleci/postgres:9.4
+
+    working_directory: ~/repo
+
+    environment:
+      # Customize the JVM maximum heap limit
+      JVM_OPTS: -Xmx3200m
+      TERM: dumb
+
     steps:
       - checkout
-      - run:
-          name: Run Tests
-          command: ./gradlew test -PclientId=$SPOTIFY_CLIENT_ID -PclientSecret=$SPOTIFY_CLIENT_SECRET
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+            - v1-dependencies-{{ checksum "build.gradle" }}
+            # fallback to using the latest cache if no exact match is found
+            - v1-dependencies-
+
+      - run: gradle dependencies
+
+      - save_cache:
+          paths:
+            - ~/.gradle
+          key: v1-dependencies-{{ checksum "build.gradle" }}
+
+      # run tests!
+      - run: gradle test -PclientId=$SPOTIFY_CLIENT_ID -PclientSecret=$SPOTIFY_CLIENT_SECRET
+