chore: move from circleci to github actions

This patch moves from circleci to github actions.

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+
+jobs:
+  build:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      matrix:
+        os: [Ubuntu, macOS, Windows]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install clippy, rustfmt and cargo-deny
+      run: |
+        rustup component add clippy
+        rustup component add rustfmt
+        cargo install cargo-deny
+    - name: Build
+      run: cargo build --verbose --features strict
+    - name: Run tests
+      run: cargo test --verbose
+    - name: Check lint
+      run: cargo clippy
+    - name: Check format
+      run: cargo fmt -- --check
+    - name: Run cargo deny
+      run: cargo deny check

Cargo.toml

@@ -18,7 +18,7 @@ include = [
 ]
 
 [features]
-default = ["strict"]
+default = []
 strict = []  # Warnings are errors
 
 [dependencies]