Use better gradle cache action for local Gradle cache (#943)

* Use better gradle cache action

* Update .github/workflows/nightly.yaml

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

.github/workflows/nightly.yaml

@@ -6,36 +6,7 @@ on:
     - cron: "24 3 * * *"
 
 jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up JDK 11
-        uses: actions/setup-java@v1
-        with:
-          java-version: 11
-      - name: Set current date as env variable
-        run: echo "::set-env name=TODAY::$(date +'%Y-%m-%d')"
-
-      - name: Cache gradle dependencies
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-gradle
-        with:
-          path: ~/.gradle
-          # Every night we refresh cache with dependencies and class compilation results.
-          # Gradle build files can change for a variety of reasons, no need to invalidate cache.
-          # TODO cache test results as well
-          # TODO replace/augment with remote gradle cache
-          key: build-${{ env.cache-name }}-${{ env.TODAY }}
-          restore-keys: |
-            build-${{ env.cache-name }}-
-
-      - name: Build with Gradle
-        run: ./gradlew assemble testClasses --stacktrace
-
   test:
-    needs: build
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -56,18 +27,10 @@ jobs:
         with:
           java-version: 11
 
-      - name: Set current date as env variable
-        run: echo "::set-env name=TODAY::$(date +'%Y-%m-%d')"
-
       - name: Cache gradle dependencies
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-gradle
+        uses: burrunan/gradle-cache-action@v1
         with:
-          path: ~/.gradle
-          key: build-${{ env.cache-name }}-${{ env.TODAY }}
-          restore-keys: |
-            build-${{ env.cache-name }}-
+          job-id: jdk${{ matrix.java }}
 
       - name: Test with Gradle
         uses: nick-invision/retry@v1
@@ -77,7 +40,6 @@ jobs:
           max_attempts: 3
 
   testLatestDep:
-    needs: build
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -86,18 +48,10 @@ jobs:
         with:
           java-version: 11
 
-      - name: Set current date as env variable
-        run: echo "::set-env name=TODAY::$(date +'%Y-%m-%d')"
-
       - name: Cache gradle dependencies
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-gradle
+        uses: burrunan/gradle-cache-action@v1
         with:
-          path: ~/.gradle
-          key: build-${{ env.cache-name }}-${{ env.TODAY }}
-          restore-keys: |
-            build-${{ env.cache-name }}-
+          job-id: latestDepTest
 
       - name: Test with Gradle
         uses: nick-invision/retry@v1