CHAIN_SPEC_PROCESSING_DELAY variable (#384)

* CHAIN_SPEC_PROCESSING_DELAY variable

* Add link to PR where it is implemented

Author: vbaranov

setup/env-variables/backend-env-variables.md

@@ -60,6 +60,7 @@ _**Note**_**: Before release 5.1.2, all environment variables of time format sup
 | `COIN_NAME`                                             | Displayed name of the coin. Also used for "Add chain to MetaMask" button and for Account functionality as native coin name in the email letters for watch list.                                                                                                                                                                                                                                                                                    | <p>Version: v4.1.2+<br>Default: (empty)<br>Applications: API</p>                                                                                                           |
 | `EMISSION_FORMAT`                                       | Should be set to `POA` if you have block emission identical to POA Network. This env var is used only if `CHAIN_SPEC_PATH` is set.                                                                                                                                                                                                                                                                                                                 | <p>Version: v2.0.4+<br>Default: <code>DEFAULT</code><br>Applications: API, Indexer</p>                                                                                     |
 | `CHAIN_SPEC_PATH`                                       | Chain specification path (absolute file system path or URL) to import block emission reward ranges and genesis account balances from. Geth- and OpenEthereum-style specs are supported.                                                                                                                                                                                                                                                            | <p>Version: v2.0.4+<br>Default: (empty)<br>Applications: API, Indexer</p>                                                                                                  |
+| `CHAIN_SPEC_PROCESSING_DELAY`                           | Chain specification path processing delay. [Time format](backend-env-variables.md#time-format). Implemented in [#11874](https://github.com/blockscout/blockscout/pull/11874).                                                                                                                                                                                                                           | <p>Version: v7.0.0+<br>Default: 15s<br>Applications: API, Indexer</p>                                                                                                  |
 | `PRECOMPILED_CONTRACTS_CONFIG_PATH`                     | Precompiled contracts description path (absolute file system path or URL) to import ABI and source code of the precompiled contracts.                                                                                                                                                                                                                                                                                                              | <p>Version: v6.5.0+<br>Default: (empty) or <code>/app/config/assets/precompiles-arbitrum.json</code> for <code>arbitrum</code> chaintype<br>Applications: API, Indexer</p> |
 | `SUPPLY_MODULE`                                         | Used by RSK in order to tell the application how to calculate the total supply of the chain. Available value is `RSK`                                                                                                                                                                                                                                                                                                                              | <p>Version: All<br>Default: (empty)<br>Applications: API, Indexer</p>                                                                                                      |
 | `POOL_SIZE`                                             | Defines the number of database connections allowed excluding read-only API endpoints requests.                                                                                                                                                                                                                                                                                                                                                     | <p>Version: All<br>Default: <code>50</code><br>Applications: API, Indexer</p>                                                                                              |