Add linters to our CI.

Author: Alexhuszagh

.github/workflows/ci.yml

@@ -1,8 +1,7 @@
 name: CI
 
 on:
-  push:
-  pull_request:
+  [push, pull_request, workflow_dispatch]
 
 jobs:
   test:

.github/workflows/lint.yml

@@ -0,0 +1,21 @@
+name: Lint
+
+on:
+  [push, pull_request, workflow_dispatch]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly
+          components: rustfmt, clippy
+      - run: cargo check
+      - run: cargo fmt -- --check
+      - run: RUSTFLAGS="--deny warnings" cargo build
+      - run: cargo clippy --all-features -- --deny warnings