platform/common/config/rush/build-cache.json

/**
 * This configuration file manages Rush's build cache feature.
 * More documentation is available on the Rush website: https://rushjs.io
 */
 {
  "$schema": "https://developer.microsoft.com/json-schemas/rush/v5/build-cache.schema.json",

  /**
   * (Required) EXPERIMENTAL - Set this to true to enable the build cache feature.
   *
   * See https://rushjs.io/pages/maintainer/build_cache/ for details about this experimental feature.
   */
  "buildCacheEnabled": true,

  /**
   * (Required) Choose where project build outputs will be cached.
   *
   * Possible values: "local-only", "azure-blob-storage", "amazon-s3"
   */
  "cacheProvider": "local-only",

  /**
   * Setting this property overrides the cache entry ID.  If this property is set, it must contain
   * a [hash] token. It may also contain a [projectName] or a [projectName:normalize] token.
   */
  "cacheEntryNamePattern": "[projectName:normalize]-[hash]",

  /**
   * Use this configuration with "cacheProvider"="azure-blob-storage"
   */
  "azureBlobStorageConfiguration": {
    /**
     * (Required) The name of the the Azure storage account to use for build cache.
     */
    // "storageAccountName": "example",

    /**
     * (Required) The name of the container in the Azure storage account to use for build cache.
     */
    // "storageContainerName": "my-container",

    /**
     * The Azure environment the storage account exists in. Defaults to AzurePublicCloud.
     *
     * Possible values: "AzurePublicCloud", "AzureChina", "AzureGermany", "AzureGovernment"
     */
    // "azureEnvironment": "AzurePublicCloud",

    /**
     * An optional prefix for cache item blob names.
     */
    // "blobPrefix": "my-prefix",

    /**
     * If set to true, allow writing to the cache. Defaults to false.
     */
    // "isCacheWriteAllowed": true
  },

  /**
   * Use this configuration with "cacheProvider"="amazon-s3"
   */
  "amazonS3Configuration": {
    /**
     * (Required) The Amazon S3 region of the bucket to use for build cache (e.g. "us-east-1").
     */
    // "s3Region": "us-east-1",

    /**
     * The name of the bucket in Amazon S3 to use for build cache.
     */
    // (Required) "s3Bucket": "my-bucket",

    /**
     * An optional prefix ("folder") for cache items.
     */
    // "s3Prefix": "my-prefix",

    /**
     * If set to true, allow writing to the cache. Defaults to false.
     */
    // "isCacheWriteAllowed": true
  }
}