String roCache = System.getenv(READONLY_CACHE_ENV_VAR);
        if (StringUtils.isNotEmpty(roCache)) {
            IncubationLogger.incubatingFeatureUsed("Shared read-only dependency cache");
            File baseDir = validateReadOnlyCache(documentationRegistry, new File(roCache).getAbsoluteFile());
            if (baseDir != null) {
                readOnlyCacheMetadata = new DefaultArtifactCacheMetadata(cacheBuilderFactory, baseDir);