Cargo test本地通过但GitHub Actions运行失败问题求助

单元测试执行时抛出如下错误：

/home/runner/.cargo/bin/cargo unit-test --locked
    Updating crates.io index
    Updating git repository `https://github.com/enigmampc/SecretNetwork`
    Updating git repository `https://github.com/Haseeb30000/secret-toolkit`
 Downloading crates ...
  Downloaded rand_chacha v0.2.2
.....
.....
  Downloaded rust_decimal v1.25.0
error: failed to parse manifest at `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_decimal-1.25.0/Cargo.toml`
Error: failed to parse manifest at `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_decimal-1.25.0/Cargo.toml`
Caused by:
  failed to parse the `edition` key
Caused by:
  this version of Cargo is older than the `2021` edition, and only supports `2015` and `2018` editions.
Error: The process '/home/runner/.cargo/bin/cargo' failed with exit code 101

• 本地环境为M1芯片MacBook Pro，执行cargo build、cargo unit-test、cargo test均正常通过
• GitHub Actions流水线执行时稳定复现上述错误，多次调整rust_decimal依赖版本（从1.17.0升级到1.25.0）均无法解决
• 项目Cargo.toml配置如下：

[package]

name = "pool_party"
version = "0.1.0"
edition = "2018"

exclude = [
  "contract.wasm",
  "hash.txt",
]

[lib]
crate-type = ["cdylib", "rlib"]

[profile.release]
opt-level = 3
debug = false
rpath = false
lto = true
debug-assertions = false
codegen-units = 1
panic = 'abort'
incremental = false
overflow-checks = true

[features]
backtraces = ["cosmwasm-std/backtraces"]

[dependencies]
cosmwasm-std = { git = "https://github.com/enigmampc/SecretNetwork", tag = "v1.0.0", features = ["staking"] }
cosmwasm-storage = { git = "https://github.com/enigmampc/SecretNetwork", tag = "v1.0.0" }
secret-toolkit = { git = "https://github.com/Haseeb30000/secret-toolkit",  branch = "master" }


schemars = "0.7"
serde = { version = "1.0.103", default-features = false, features = ["derive"] }
serde_json = "1.0.1"
snafu = { version = "0.6.3" }
bincode2 = "2.0.1"
subtle = { version = "2.2.3", default-features = false }
base64 = "0.12.3"
hex = "0.4.2"
rust_decimal = { version = "1.25.0", default-features = false}

rand_chacha = { version = "0.2.2", default-features = false }
rand = { version = "0.7.3" }
sha2 = { version = "0.9.1", default-features = false }

[dev-dependencies]
cosmwasm-schema = { version = "0.10.0" }

• CI流水线yaml配置如下：

on: [push, pull_request]

name: Basic

jobs:

  test:
    name: Test Suite
    runs-on: ubuntu-latest
    steps:
      - name: Checkout sources
        uses: actions/checkout@v2

      - name: Install stable toolchain
        uses: actions-rs/toolchain@v1
        with:
          profile: minimal
          toolchain: 1.46.0
          target: wasm32-unknown-unknown
          override: true

      - name: Run unit tests
        uses: actions-rs/cargo@v1
        with:
          command: unit-test
          args: --locked
        env:
          RUST_BACKTRACE: 1

      - name: Compile WASM contract
        uses: actions-rs/cargo@v1
        with:
          command: wasm
          args: --locked
        env:
          RUSTFLAGS: "-C link-arg=-s"

      - name: Run integration tests
        uses: actions-rs/cargo@v1
        with:
          command: integration-test
          args: --locked


  lints:
    name: Lints
    runs-on: ubuntu-latest
    steps:
      - name: Checkout sources
        uses: actions/checkout@v2

      - name: Install stable toolchain
        uses: actions-rs/toolchain@v1
        with:
          profile: minimal
          toolchain: 1.46.0
          override: true
          components: rustfmt, clippy

      - name: Run cargo fmt
        uses: actions-rs/cargo@v1
        with:
          command: fmt
          args: --all -- --check

      - name: Run cargo clippy
        uses: actions-rs/cargo@v1
        with:
          command: clippy
          args: -- -D warnings

      - name: Generate Schema
        uses: actions-rs/cargo@v1
        with:
          command: schema
          args: --locked

错误日志已经明确给出原因：当前CI环境安装的Cargo版本过旧，仅支持2015、2018 edition，无法解析使用2021 edition的依赖包。
Rust从1.56.0版本开始正式支持2021 edition，CI配置中硬编码使用1.46.0版本的工具链，远低于支持2021 edition的最低版本要求；本地环境Rust版本高于1.56.0，因此可以正常解析依赖、完成编译测试。
rust_decimal 1.24.0及以上版本默认使用2021 edition，因此无论将该依赖调整到1.25.0还是更高的新兼容版本，在1.46.0的工具链下都会触发相同的解析错误，和项目本身配置的edition = "2018"没有关系。

二选一即可，优先选择第一种：

• 方案1（推荐）：升级CI环境的Rust工具链版本
  将CI配置中所有硬编码的toolchain: 1.46.0替换为≥1.56.0的版本，考虑到SecretNetwork合约的兼容性要求，选择1.60.0稳定版即可，test、lints两个job的工具链配置都要同步修改，修改示例：

  - name: Install stable toolchain
    uses: actions-rs/toolchain@v1
    with:
      profile: minimal
      toolchain: 1.60.0
      target: wasm32-unknown-unknown
      override: true
  

  改完后Cargo可以正常识别2021 edition的依赖配置，错误直接消失。
• 方案2：若有特殊要求必须锁死1.46.0版本工具链
  将rust_decimal依赖降级到最后一个兼容Rust 1.46、使用2018 edition的版本（1.23.0），修改Cargo.toml中的依赖配置：

  rust_decimal = { version = "=1.23.0", default-features = false}
  

  降级后需要本地跑全量测试，确认业务逻辑没有版本兼容问题。

内容的提问来源于stack exchange，提问作者Haseeb Saeed