ci: set up build and release workflows

.github/workflows/build.yml

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+name: Build & Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache dependencies
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run tests
+        run: cargo test
+
+  build:
+    name: Build
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+          # TODO: eventually we'd like to gate certain features
+          # behind target OS, at which point this may be usable.
+          #- os: macos-latest
+          #  target: x86_64-apple-darwin
+          #- os: windows-latest
+          #  target: x86_64-pc-windows-msvc
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Cache dependencies
+        uses: Swatinem/rust-cache@v2
+
+      - name: Build
+        run: cargo build --release --target ${{ matrix.target }}
+

.github/workflows/release.yml

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+name: Publish Release Builds
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write
+
+jobs:
+  create-release:
+    runs-on: ubuntu-latest
+    outputs:
+      upload_url: ${{ steps.create_release.outputs.upload_url }}
+      release_id: ${{ steps.create_release.outputs.id }}
+    steps:
+      - name: Create Release
+        id: create_release
+        uses: softprops/action-gh-release@v2
+        with:
+          draft: false
+          prerelease: false
+          generate_release_notes: true
+
+  build-release:
+    needs: create-release
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+            name: superfreq-linux-amd64
+            cross: false
+          - os: ubuntu-latest
+            target: aarch64-unknown-linux-gnu
+            name: superfreq-linux-arm64
+            cross: true
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Cache dependencies
+        uses: Swatinem/rust-cache@v2
+
+      - name: Setup cross-compilation (Linux ARM64)
+        if: matrix.cross && matrix.os == 'ubuntu-latest'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-aarch64-linux-gnu
+
+      - name: Install cross
+        if: matrix.cross
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cross
+
+      - name: Build binary (native)
+        if: ${{ !matrix.cross }}
+        run: cargo build --release --target ${{ matrix.target }}
+
+      - name: Build binary (cross)
+        if: ${{ matrix.cross }}
+        run: cross build --release --target ${{ matrix.target }}
+
+      - name: Upload Release Asset
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ${{ matrix.name }}
+
+  generate-checksums:
+    needs: [create-release, build-release]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Download Assets
+        uses: robinraju/release-downloader@v1
+        with:
+          tag: ${{ github.ref_name }}
+          fileName: "superfreq-*"
+          out-file-path: "."
+
+      - name: Generate checksums
+        run: |
+          sha256sum superfreq-* > SHA256SUMS
+
+      - name: Upload Checksums
+        uses: softprops/action-gh-release@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          files: SHA256SUMS
+

.github/workflows/tag.yml

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+name: Create Tag from Crate Version
+
+concurrency: tag
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  tag:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: cachix/install-nix-action@master
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Read Version
+        run: |
+          echo -n "version=v" >> "$GITHUB_ENV"
+          nix run nixpkgs#fq -- -r ".package.version" Cargo.toml >> "$GITHUB_ENV"
+          cat "$GITHUB_ENV"
+
+      - name: Create Tag
+        run: |
+          set -x
+          git tag $version
+          git push --tags || :