Add gradle version to cache key

Don't reuse cache if we change gradle version
even if dependencies haven't changed.

Author: RobertLK

.github/workflows/pr.yml

@@ -12,9 +12,9 @@ jobs:
       uses: actions/cache@v1
       with:
         path: ~/.gradle
-        key: ${{ runner.os }}-gradle-${{ hashFiles('gradle.properties') }}
+        key: ${{ runner.os }}-gradle${{ hashFiles('gradle/wrapper/gradle-wrapper.properties')}}-${{ hashFiles('gradle.properties')}}
         restore-keys: |
-          ${{ runner.os }}-gradle-
+          ${{ runner.os }}-gradle${{ hashFiles('gradle/wrapper/gradle-wrapper.properties')}}-
           ${{ runner.os }}-
     - name: set up JDK 1.8
       uses: actions/setup-java@v1

.github/workflows/publish.yml

@@ -15,9 +15,9 @@ jobs:
       uses: actions/cache@v1
       with:
         path: ~/.gradle
-        key: ${{ runner.os }}-gradle-${{ hashFiles('gradle.properties') }}
+        key: ${{ runner.os }}-gradle${{ hashFiles('gradle/wrapper/gradle-wrapper.properties')}}-${{ hashFiles('gradle.properties')}}
         restore-keys: |
-          ${{ runner.os }}-gradle-
+          ${{ runner.os }}-gradle${{ hashFiles('gradle/wrapper/gradle-wrapper.properties')}}-
           ${{ runner.os }}-
     - name: set up JDK 1.8
       uses: actions/setup-java@v1