I am experiencing build failures while deploying my Rust application on Railway. The application had previously deployed successfully multiple times without issues, but it now consistently fails during the build phase.

The errors seem to involve the setup for the x86_64-unknown-linux-musl target and related dependencies.

LOGS:
setup │ binutils, gcc, (rust-bin.stable.latest.default.override { ║
║ │ targets = ["x86_64-unknown-linux-musl"]; }), musl, musl.dev

build │ mkdir -p bin ║
║ │ cargo build --release --target x8664-unknown-linux-musl ║ ║ │ cp target/x8664-unknown-linux-musl/release/zenithkids-be bin

11 26.12 error: attribute 'rust' missing

11 26.12 at /nix/store/x0b87ac1wjr0z9dprzi2zmwn96v4zyqn-source/lib/rust-bin.nix:25:28

11 26.12 Did you mean rustc?

11 ERROR: process "/bin/bash -ol pipefail -c nix-env -if .nixpacks/nixpkgs-*.nix && nix-collect-garbage -d" did not complete successfully: exit code: 1

Nixpack.toml:
[phases.setup]
nixPkgs = [
"binutils",
"gcc",
"rustc",
"cargo",
"musl",
"musl.dev",
"openssl.dev",
"postgresql.lib"
]
aptPkgs = [
"libssl-dev",
"pkg-config",
"libpq-dev",
"build-essential"
]

[phases.build]
dependsOn = ["setup"]
cmds = [
"rustup default stable",
"rustup target add x8664-unknown-linux-musl", "cargo build --release --locked --target x8664-unknown-linux-musl --verbose"
]

[phases.install]
dependsOn = ["build"]
cmds = [
"mkdir -p bin",
"cp target/x86_64-unknown-linux-musl/release/zenithkids-be bin/"
]

[start]
cmd = "./bin/zenithkids-be"

[nix]
inputs.nixpkgs.url = "github:NixOS/nixpkgs/22.11"

Cargo.toml:
[package]
name = "zenithkids-be"
version = "0.1.0"
edition = "2021"

[dependencies]
thiserror = "2.0"
actix-web = "4.9.0"
actix-cors = "0.7.0"
dotenv = "0.15.0"
colored = "2.2.0"
sqlx = { version = "0.8.2", features = ["runtime-tokio-rustls", "postgres", "migrate", "uuid", "time", "chrono"] }
tokio = { version = "1", features = ["full"] }
serde = { version = "1.0", features = ["derive"] }
serdejson = "1.0" uuid = { version = "1.10.0", features = ["v4", "serde"] } reqwest = { version = "0.11", default-features = false, features = ["rustls-tls", "json"] } jsonwebtoken = { version = "9.3.0" } chrono = "0.4.39" argon2 = "0.5.3" futures = "0.3.31" utoipa = { version = "5.3", features = ["actixextras"] }
utoipa-swagger-ui = { version = "8.1", features = ["actix-web"] }
time = "0.3.37"

Github:
The repo is private so I cannot share the link.

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