Add build automation

.github/workflows/build.yml

@@ -0,0 +1,136 @@
+name: Build
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  metadata:
+    name: Check if version changed
+    runs-on: ubuntu-latest
+    outputs:
+      optimize-build: ${{ github.event_name == 'push' }}
+      release: ${{ github.event_name == 'push' && github.repository == 'Quantco/pixi-pack' && steps.version-metadata.outputs.changed == 'true' }}
+      version: ${{ steps.version-metadata.outputs.newVersion }}
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v4
+      - uses: Quantco/ui-actions/version-metadata@a0653e9fc0ee3c4be9f7cc88e509e40536e9f3c1
+        id: version-metadata
+        with:
+          file: ./Cargo.toml
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version-extraction-override: 'regex:version = "(.*)"'
+
+  build:
+    name: Build Binary
+    runs-on: ${{ matrix.os }}
+    needs: [metadata]
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - target: x86_64-unknown-linux-musl
+            os: ubuntu-latest-4core
+          - target: aarch64-unknown-linux-musl
+            os: ubuntu-latest-arm-4core
+          - target: x86_64-pc-windows-msvc
+            os: windows-latest
+          - target: aarch64-apple-darwin
+            os: macos-latest
+          - target: x86_64-apple-darwin
+            os: macos-13
+    env:
+      #
+      # These are some environment variables that configure the build so that the binary size is reduced.
+      # Inspiration was taken from this blog: https://arusahni.net/blog/2020/03/optimizing-rust-binary-size.html
+      # They're only enable it on main and releases.
+      #
+
+      # Enable Link Time Optimization (LTO) for our release builds. This increases link time but drastically reduces
+      # binary size.
+      CARGO_PROFILE_RELEASE_LTO: ${{ needs.metadata.outputs.optimize-build }}
+
+      # Use a single code gen unit, this effectively disables parallel linking but ensures that everything is linked
+      # together in a single unit which reduces the file-size at the cost of link time.
+      # Default for a release build is 16
+      CARGO_PROFILE_RELEASE_CODEGEN_UNITS: ${{ needs.metadata.outputs.optimize-build && 1 || 16 }}
+
+      # Strip the binaries. This reduces the filesize of the final release.
+      CARGO_PROFILE_RELEASE_STRIP: ${{ needs.metadata.outputs.optimize-build && 'symbols' || 'false' }}
+
+      # Optimize the binary for size. This reduces the filesize at the cost of a slower binary.
+      CARGO_PROFILE_OPT_LEVEL: ${{ needs.metadata.outputs.optimize-build && 's' || '0' }}
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v4
+
+      - name: Set up pixi
+        uses: prefix-dev/setup-pixi@ba3bb36eb2066252b2363392b7739741bb777659
+        with:
+          activate-environment: true
+
+      - name: Use static CRT on Windows
+        shell: bash
+        run: echo "RUSTFLAGS=${RUSTFLAGS} -C target-feature=+crt-static" >> "${GITHUB_ENV}"
+        if: endsWith(matrix.target, 'windows-msvc')
+
+      - uses: Swatinem/rust-cache@23bce251a8cd2ffc3c1075eaa2367cf899916d84
+        with:
+          key: build-${{ matrix.target }}
+
+      - name: Show version information (Rust, cargo, GCC)
+        run: |
+          gcc --version || true
+          rustup -V
+          rustup toolchain list
+          cargo -V
+          rustc -V
+
+      - name: Use rustls on musl targets.
+        id: build-options
+        if: contains(matrix.target, '-musl')
+        run: |
+          echo "CARGO_BUILD_OPTIONS=${CARGO_BUILD_OPTIONS} --no-default-features --features rustls-tls" >> $GITHUB_OUTPUT
+
+      - name: Build
+        run: >
+          cargo build
+          --locked
+          --release
+          ${{ steps.build-options.outputs.CARGO_BUILD_OPTIONS }}
+
+      - name: "Artifact upload: binary"
+        uses: actions/upload-artifact@v4
+        with:
+          name: pixi-pack-${{ matrix.target }}${{ endsWith(matrix.target, 'windows-msvc') && '.exe' || '' }}
+          path: target/${{ matrix.target }}/release/pixi-pack${{ endsWith(matrix.target, 'windows-msvc') && '.exe' || '' }}
+
+  release:
+    name: Create Release
+    needs: [metadata, build]
+    if: needs.metadata.outputs.release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: pixi-pack-*
+          path: target
+      - run: |
+          tree target
+      # - name: Push v${{ needs.metadata.outputs.version }} tag
+      #   run: |
+      #     git tag v${{ needs.metadata.outputs.version }}
+      #     git push origin v${{ needs.metadata.outputs.version }}
+      # - name: Create Release
+      #   uses: softprops/action-gh-release@69320dbe05506a9a39fc8ae11030b214ec2d1f87
+      #   if: needs.metadata.outputs.release
+      #   with:
+      #     generate_release_notes: true
+      #     tag_name: v${{ needs.metadata.outputs.version }}
+      #     draft: true
+      #     files: |
+      #       target/*/release/pixi-pack*