Add GitHub Actions workflows for CI and releases

- CI workflow: runs on push/PR, checks formatting, clippy, and builds on all platforms
- Release workflow: builds cross-platform binaries and publishes to GitHub releases on tags

Author: tekacs

.github/workflows/ci.yml

@@ -0,0 +1,48 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+    
+    - name: Check formatting
+      run: cargo fmt -- --check
+    
+    - name: Run clippy
+      run: cargo clippy -- -D warnings
+    
+    - name: Build
+      run: cargo build --verbose
+    
+    - name: Run tests
+      run: cargo test --verbose
+
+  build:
+    name: Build on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+    
+    - name: Build
+      run: cargo build --release

.github/workflows/release.yml

@@ -0,0 +1,82 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build and Release
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+            artifact_name: llm-pricing
+            asset_name: llm-pricing-linux-x86_64
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-musl
+            artifact_name: llm-pricing
+            asset_name: llm-pricing-linux-x86_64-musl
+          - os: macos-latest
+            target: x86_64-apple-darwin
+            artifact_name: llm-pricing
+            asset_name: llm-pricing-macos-x86_64
+          - os: macos-latest
+            target: aarch64-apple-darwin
+            artifact_name: llm-pricing
+            asset_name: llm-pricing-macos-aarch64
+          - os: windows-latest
+            target: x86_64-pc-windows-msvc
+            artifact_name: llm-pricing.exe
+            asset_name: llm-pricing-windows-x86_64.exe
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: ${{ matrix.target }}
+
+    - name: Install musl tools
+      if: matrix.target == 'x86_64-unknown-linux-musl'
+      run: sudo apt-get install -y musl-tools
+
+    - name: Build
+      run: cargo build --release --target ${{ matrix.target }}
+
+    - name: Strip binary (Linux and macOS)
+      if: matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'
+      run: strip target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+
+    - name: Upload binaries to release
+      uses: softprops/action-gh-release@v2
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        files: |
+          target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+        name: ${{ matrix.asset_name }}
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  create-release:
+    name: Create Release
+    runs-on: ubuntu-latest
+    needs: build
+    if: startsWith(github.ref, 'refs/tags/')
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Create Release
+      uses: softprops/action-gh-release@v2
+      with:
+        draft: false
+        prerelease: false
+        generate_release_notes: true
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}