add pinocchio create-token example (#599)

* add pinocchio create-token example

* create-token pinocchio: address review feedback

- prepare.mjs: dump program via 'solana program dump -um' instead of
  mutating the user's Solana CLI config
- reuse pinocchio_token Mint::LEN instead of a hand-rolled MINT_SIZE const
- move CreateTokenArgs into create_token.rs (ix-specific) and the borsh
  string helpers into a util module; slim mod.rs to module wiring
- tests: run async bankrun setup in a before() hook so the it() blocks
  actually register (a describe callback runs synchronously)

* create-token pinocchio: fix runtime failure exposed by the now-running tests

The tests were previously registered inside an async describe callback, so
mocha ran 0 of them and CI passed without ever executing the program. With
the before() hook they actually run — and surfaced a real failure:

  Program log: Instruction: CreateToken
  failed: unsupported BPF instruction

Root cause: Rent::try_minimum_balance() takes a floating-point path for the
exemption threshold (an f64), which the current platform-tools lower to a
float instruction the solana-bankrun VM rejects. Compute the rent-exempt
minimum with integer math using pinocchio's default rent constants instead
(DEFAULT_LAMPORTS_PER_BYTE already folds in the 2-year threshold).

While here, make the program alloc-free: build the Metaplex instruction data
in a fixed stack buffer and switch to program_entrypoint! + no_allocator!,
matching the other pinocchio examples.

Verified with cargo build-sbf (Solana 4.1.1 / platform-tools v1.54) + the
bankrun test: both cases pass.

* create-token pinocchio: rustfmt write_bytes signature

* create-token pinocchio: move Metaplex helpers into util_metaplex

Address review feedback: the Metaplex Token Metadata program ID, the
CreateMetadataAccountV3 discriminator, the metadata-data size bound, and
the instruction-data builder now live in util_metaplex.rs, keeping
create_token.rs focused on the account/CPI flow.

---------

Co-authored-by: MarkFeder <5670736+MarkFeder@users.noreply.github.com>

Author: MarkFeder

Cargo.lock

@@ -51,6 +51,7 @@ members = [
     "basics/transfer-sol/asm",
 
     # tokens
+    "tokens/create-token/pinocchio/program",
     "tokens/escrow/pinocchio/program",
     "tokens/transfer-tokens/pinocchio/program",
     "tokens/token-2022/mint-close-authority/native/program",

Cargo.toml

@@ -125,7 +125,7 @@ How to store state that changes size in Solana.
 
 [Create a token on Solana with a token symbol and icon.](./tokens/create-token/README.md)
 
-[anchor](./tokens/create-token/anchor) [native](./tokens/create-token/native)
+[anchor](./tokens/create-token/anchor) [pinocchio](./tokens/create-token/pinocchio) [native](./tokens/create-token/native)
 
 ### Minting NFTS
 

README.md

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# This script is for quick building & deploying of the program.
+# It also serves as a reference for the commands used for building & deploying Solana programs.
+# Run this bad boy with "bash cicd.sh" or "./cicd.sh"
+
+cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./program/target/so
+solana program deploy ./program/target/so/program.so

tokens/create-token/pinocchio/cicd.sh

@@ -0,0 +1,24 @@
+{
+  "type": "module",
+  "scripts": {
+    "postinstall": "node prepare.mjs",
+    "test": "pnpm ts-mocha -p ./tsconfig.json -t 1000000 ./tests/test.ts",
+    "build-and-test": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./tests/fixtures && pnpm test",
+    "build": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./program/target/so",
+    "deploy": "solana program deploy ./program/target/so/program.so"
+  },
+  "dependencies": {
+    "@solana/web3.js": "^1.98.4",
+    "borsh": "^2.0.0"
+  },
+  "devDependencies": {
+    "@types/bn.js": "^5.1.0",
+    "@types/chai": "^4.3.1",
+    "@types/mocha": "^9.1.1",
+    "chai": "^4.3.4",
+    "mocha": "^9.0.3",
+    "solana-bankrun": "^0.3.0",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^4.3.5"
+  }
+}