update cargo_toml dependency (railwayapp#1174)

* update cargo_toml dependency

* update msrv to 1.70.0

* update flakes

* add toml config file test

.github/workflows/ci.yml

@@ -172,7 +172,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.60.0
+          toolchain: 1.70.0
           override: true
 
       - uses: Swatinem/rust-cache@v2

Cargo.toml

@@ -46,7 +46,7 @@ base64 = "0.20.0"
 console = { default-features = false, version = "0.15.2" }
 box_drawing = "0.1.2"
 textwrap = { default-features = false, version = "0.16.0" }
-cargo_toml = "0.13.0"
+cargo_toml = "0.20.4"
 rand = "0.8.5"
 path-slash = "0.2.1"
 ignore = "0.4.18"

README.md

@@ -2,7 +2,7 @@
 
 [![CI](https://github.com/railwayapp/nixpacks/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/railwayapp/nixpacks/actions/workflows/ci.yml)
 [![Crates.io](https://img.shields.io/crates/v/nixpacks)](https://crates.io/crates/nixpacks)
-[![Rust: 1.60+](https://img.shields.io/badge/rust-1.60+-93450a)](https://blog.rust-lang.org/2022/04/07/Rust-1.60.0.html)
+[![Rust: 1.70+](https://img.shields.io/badge/rust-1.70+-93450a)](https://blog.rust-lang.org/2023/06/01/Rust-1.70.0.html)
 
 **App source + Nix packages + Docker = Image**
 

examples/config-toml-file/nixpacks.toml

@@ -0,0 +1,12 @@
+[variables]
+HELLO = "hey there"
+
+[phases.setup]
+nixPkgs = ["cowsay"]
+
+[phases.custom]
+dependsOn = ["setup"]
+cmds = ['echo building!']
+
+[start]
+cmd = "cowsay ${HELLO}"