ci: add quality check workflow

.github/workflows/check.yaml

@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ci-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check_fmt_and_test:
+    name: Check, Format, and Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: rustfmt
+      # - uses: Swatinem/rust-cache@v2
+      #   with:
+      #     shared-key: check
+      #     cache-on-failure: true
+      - run: cargo fmt --check
+      - run: cargo clippy --all-targets --all-features
+      - run: cargo test

src/env.rs

@@ -4,5 +4,5 @@ use std::env;
 pub static ERGO_NODE_URL: Lazy<String> = Lazy::new(|| get_var("ERGO_NODE_URL"));
 
 fn get_var(key: &str) -> String {
-    env::var(key).expect(&format!("Environment variable `{}` must be set", key))
+    env::var(key).unwrap_or_else(|_| panic!("Environment variable `{key}` must be set"))
 }

src/lib.rs

@@ -2,5 +2,5 @@ pub mod clients;
 pub mod env;
 pub mod error;
 pub mod mempool;
-pub mod types;
 pub mod tracing;
+pub mod types;