enable sccache-dist in java jobs

Author: trxcllnt

.github/workflows/build.yaml

@@ -131,6 +131,7 @@ jobs:
       artifact-name: "cuvs-java-cuda${{ matrix.cuda_version }}"
       file_to_upload: "java/cuvs-java/target/"
       sha: ${{ inputs.sha }}
+      sccache-dist-token-secret-name: GIST_REPO_READ_ORG_GITHUB_TOKEN
   python-build:
     needs: [cpp-build]
     secrets: inherit

.github/workflows/pr.yaml

@@ -239,6 +239,7 @@ jobs:
       script: "ci/test_java.sh"
       artifact-name: "cuvs-java-cuda${{ matrix.cuda_version }}"
       file_to_upload: "java/cuvs-java/target/"
+      sccache-dist-token-secret-name: GIST_REPO_READ_ORG_GITHUB_TOKEN
   rust-build:
     needs: [conda-cpp-build, changed-files]
     secrets: inherit

.github/workflows/test.yaml

@@ -72,6 +72,7 @@ jobs:
       arch: "amd64"
       container_image: "rapidsai/ci-conda:25.12-cuda${{ matrix.cuda_version }}-ubuntu24.04-py3.13"
       script: "ci/test_java.sh"
+      sccache-dist-token-secret-name: GIST_REPO_READ_ORG_GITHUB_TOKEN
   wheel-tests-cuvs:
     secrets: inherit
     uses: rapidsai/shared-workflows/.github/workflows/wheels-test.yaml@release/25.12

ci/build_java.sh

@@ -4,6 +4,12 @@
 
 set -euo pipefail
 
+source rapids-configure-sccache
+
+export SCCACHE_S3_KEY_PREFIX="cuvs-java/${RAPIDS_CONDA_ARCH}/cuda${RAPIDS_CUDA_VERSION%%.*}/maven/objects-cache"
+export SCCACHE_S3_PREPROCESSOR_CACHE_KEY_PREFIX="cuvs-java/${RAPIDS_CONDA_ARCH}/cuda${RAPIDS_CUDA_VERSION%%.*}/maven/preprocessor-cache"
+export SCCACHE_S3_USE_PREPROCESSOR_CACHE_MODE=true
+
 # TODO: Remove this argument-handling when build and test workflows are separated,
 #       and test_java.sh no longer calls build_java.sh
 #       ref: https://github.com/rapidsai/cuvs/issues/868
@@ -49,5 +55,8 @@ export RAPIDS_CUDA_MAJOR
 
 bash ./build.sh java "${EXTRA_BUILD_ARGS[@]}"
 
+sccache --show-adv-stats
+sccache --stop-server >/dev/null 2>&1 || true
+
 rapids-logger "Test script exiting with value: $EXITCODE"
 exit ${EXITCODE}