adding github actions for linting and testing

.github/workflows/ci.yml

@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache Rust
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: false
+          shared-key: base
+
+      - name: Install Cargo tools
+        run: |
+          rustup component add rustfmt clippy
+
+      - name: Check for license headers
+        run: ./ci/lintHeaders.sh
+
+      - name: "`cargo fmt` check"
+        run: |
+          cargo fmt --all -- --check
+
+      - name: "Clippy check on"
+        run: |
+          cargo clippy --all-targets -- -D warnings
+
+  test:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache Rust
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: false
+          shared-key: base
+
+      - name: Run tests
+        run: |
+          cargo test

ci/lintHeaders.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# Finds files in a given directory with a given file extension that don't have
+# an MPL license header.
+# $ lintHeaders ./src *.rs
+
+license1="/* This Source Code Form is subject to the terms of the Mozilla Public"
+license2=" * License, v. 2.0. If a copy of the MPL was not distributed with this"
+license3=" * file, You can obtain one at https://mozilla.org/MPL/2.0/. */"
+
+files=( $(find src -name "**/*.rs") )
+
+echo "Checking the following files for license headers: ${files[@]}"
+result=0
+
+headerLineNumbers() {
+   grep -Fn -e "$license1" -e "$license2" -e "$license3" "$1" | cut -f1 -d:
+}
+
+expectedHeaderLineNumbers='1
+2
+3'
+
+for file in ${files[@]}; do
+  if ! [ "$(headerLineNumbers $file)" = "$expectedHeaderLineNumbers" ]; then
+    echo "$file"
+    result=1
+  fi
+done
+
+exit $result

src/keys.rs

@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
 use crate::frost::keys::PublicKeyPackage as FrostPublicKeyPackage;
 use crate::frost::VerifyingKey;
 use crate::participant::Identity;