add: nix stuff

.envrc

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+use nix

.github/workflows/linting.yml

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+name: Linting
+on: [push, pull_request]
+
+jobs:
+  cargo-deny:
+    name: Cargo dependency linting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: EmbarkStudios/cargo-deny-action@v1
+  clippy:
+    name: Clippy linting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          components: clippy
+          override: true
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features
+          name: Clippy Output
+  fmt:
+    name: Check formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          components: rustfmt
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check

.github/workflows/testing.yml

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+name: Testing
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: Run tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - nightly
+          - stable
+          - 1.60.0
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test

.vscode/settings.json

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+{
+  "nixEnvSelector.nixFile": "${workspaceRoot}/shell.nix"
+}

deny.toml

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+# More information: https://embarkstudios.github.io/cargo-deny/index.html
+targets = [
+    { triple = "x86_64-unknown-linux-gnu" },
+    { triple = "aarch64-unknown-linux-gnu" },
+    { triple = "x86_64-unknown-linux-musl" },
+    { triple = "aarch64-apple-darwin" },
+    { triple = "x86_64-apple-darwin" },
+    { triple = "x86_64-pc-windows-msvc" },
+]
+
+[advisories]
+db-path = "~/.cargo/advisory-db"
+db-urls = ["https://github.com/rustsec/advisory-db"]
+
+vulnerability = "deny"
+unmaintained = "warn"
+yanked = "warn"
+notice = "warn"
+
+[licenses]
+allow = [
+    "MIT",
+    "Apache-2.0",
+    "BSD-3-Clause",
+    "Unicode-DFS-2016"
+]
+
+# Deny all unlicensed, copyleft and other not explicitly allowed licenses
+unlicensed = "deny"
+copyleft = "deny"
+allow-osi-fsf-free = "neither"
+default = "deny"
+
+# Some crates require weird licenses, exceptions for those crates can be made here
+exceptions = []
+
+# The confidence threshold for detecting a license from license text.
+# The higher the value, the more closely the license text must be to the
+# canonical license text of a valid SPDX license file.
+confidence-threshold = 0.8
+
+[bans]
+multiple-versions = "warn"
+wildcards = "allow"
+highlight = "all"
+
+[sources]
+unknown-registry = "deny"
+unknown-git = "deny"
+
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
+allow-git = []

rustfmt.toml

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+edition = "2021"
+use_field_init_shorthand = true
+use_try_shorthand = true

shell.nix

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+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  rust-overlay = (import (builtins.fetchTarball "https://github.com/oxalica/rust-overlay/archive/master.tar.gz"));
+  pkgs = (import <nixpkgs> {
+    overlays = [ rust-overlay ];
+  });
+in
+pkgs.mkShell {
+  buildInputs = [
+    (pkgs.rust-bin.stable.latest.default.override {
+      extensions = [ "rust-src" ];
+    })
+  ];
+  PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig";
+  # nativeBuildInputs is usually what you want -- tools you need to run
+  nativeBuildInputs = [
+    pkgs.pkg-config
+    pkgs.rust-analyzer
+    pkgs.cargo-deny
+  ];
+}