allow CLI flags to be set using env variables

We had a problem that while deploying we couldn't change the CLI
command. However, we can add env variables. This commit solves the given
problem. All flags can now optionally be added as env variables. They
need to be prefixed with NEUME.

For example, the below commands are equal
- npx neume crawl --from 0
- NEUME_FROM=0 npx neume crawl

dist/neume.js

@@ -13,6 +13,7 @@ import init from "./commands/init.js";
 import { db } from "./database/index.js";
 const argv = yargs(hideBin(process.argv))
     .usage("Usage: $0 <command> <options>")
+    .env("NEUME")
     .command("crawl", "Find new NFTs from the list of already known contracts", {
     from: {
         type: "number",

neume.ts

@@ -16,6 +16,7 @@ import { db } from "./database/index.js";
 
 const argv = yargs(hideBin(process.argv))
   .usage("Usage: $0 <command> <options>")
+  .env("NEUME")
   .command(
     "crawl",
     "Find new NFTs from the list of already known contracts",