feat: add CI, audit, publish, and dependabot workflows

.github/workflows/audit.yml

@@ -0,0 +1,31 @@
+name: Audit
+
+on:
+  push:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+  pull_request:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+  schedule:
+    - cron: '0 0 * * *'
+
+permissions:
+  contents: read
+  issues: write
+  checks: write
+
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install Rust
+        run: |
+          rustup override set stable
+          rustup update stable
+      - uses: rustsec/audit-check@v2.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci.yml

@@ -0,0 +1,75 @@
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  fmt:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install Rust
+        run: |
+          rustup override set stable
+          rustup update stable
+          rustup component add rustfmt
+      - run: cargo fmt --all --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install Rust
+        run: |
+          rustup override set stable
+          rustup update stable
+          rustup component add clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo clippy --all-targets --all-features -- -D warnings
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        features:
+          - ""
+          - "serde"
+          - "async"
+          - "serde,async"
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install Rust
+        run: |
+          rustup override set stable
+          rustup update stable
+      - uses: Swatinem/rust-cache@v2
+      - name: Run tests
+        run: |
+          if [ -z "${{ matrix.features }}" ]; then
+            cargo test --verbose
+          else
+            cargo test --verbose --features "${{ matrix.features }}"
+          fi
+
+  docs:
+    name: Docs
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install Rust
+        run: |
+          rustup override set stable
+          rustup update stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo doc --all-features --no-deps
+        env:
+          RUSTDOCFLAGS: -D warnings

.github/workflows/publish.yml

@@ -0,0 +1,35 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - "v*"
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  publish:
+    name: Publish to crates.io
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install Rust
+        run: |
+          rustup override set stable
+          rustup update stable
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Verify version matches tag
+        run: |
+          CARGO_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version')
+          TAG_VERSION="${GITHUB_REF_NAME#v}"
+          if [ "$CARGO_VERSION" != "$TAG_VERSION" ]; then
+            echo "Error: Cargo.toml version ($CARGO_VERSION) doesn't match tag ($TAG_VERSION)"
+            exit 1
+          fi
+
+      - name: Publish
+        run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}