Try to use env.java-version in cache

Author: oliemansm

.github/workflows/gradle.yml

@@ -24,15 +24,17 @@ jobs:
         uses: actions/setup-java@v1
         with:
           java-version: ${{ matrix.java }}
-#      - name: Cache Gradle
-#        uses: actions/cache@v2
-#        with:
-#          path: |
-#            ~/.gradle/caches
-#            ~/.gradle/wrapper
-#          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*') }}
-#          restore-keys: |
-#            ${{ runner.os }}-gradle-
+      - name: Cache Gradle
+        uses: actions/cache@v2
+        env:
+          java-version: ${{ matrix.java }}
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-${{ env.java-version }}-gradle-${{ hashFiles('**/*.gradle*') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ env.java-version }}-gradle-
       - name: Make gradlew executable (non-Windows only)
         if: matrix.os != 'windows-latest'
         run: chmod +x ./gradlew