Add .gradle to cache

Author: adangel

.github/workflows/build.yml

@@ -25,6 +25,7 @@ jobs:
         path: |
           ~/.m2/repository
           ~/.cache
+          ~/.gradle
           vendor/bundle
           target/repositories
         key: v3-${{ runner.os }}-${{ hashFiles('pmdtester.gemspec') }}

.github/workflows/manual-integration-tests.yml

@@ -18,6 +18,7 @@ jobs:
         path: |
           ~/.m2/repository
           ~/.cache
+          ~/.gradle
           vendor/bundle
           target/repositories
         key: v3-${{ runner.os }}-${{ hashFiles('pmdtester.gemspec') }}