ci: add lint workflow

.github/workflows/test.yaml

@@ -0,0 +1,26 @@
+name: Build and Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  codestyle:
+    name: Codestyle
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo check
+        env:
+          RUSTFLAGS: '-D unused'
+      - run: cargo clippy -- -D clippy::all
+      - run: cargo fmt --check

src/main.rs

@@ -1,6 +1,6 @@
 use anyhow::{Ok, Result};
 use base64::prelude::*;
-use clap::{ArgAction, Parser, Subcommand};
+use clap::{Parser, Subcommand};
 use humantime::Duration;
 use pasetors::{
     claims::Claims,
@@ -9,7 +9,6 @@ use pasetors::{
     version4::V4,
 };
 use std::io::{self, Read};
-use std::str::FromStr;
 use thiserror::Error;
 
 #[derive(Error, Debug)]