build.yml

name: Build

# Reusable cross-platform build matrix. Builds every app binary statically
# (CGO_ENABLED=0, -trimpath) for all 6 OS/arch combos and uploads them as
# workflow artifacts. Callable from other workflows via workflow_call (used by
# release.yml) and runnable on demand via workflow_dispatch.
on:
  workflow_call:
    inputs:
      apps:
        description: "JSON array of apps to build (default: all five)."
        type: string
        required: false
        default: '["grid","prism","pulse","strata","vault"]'
      version:
        description: "Version string stamped into the binary (e.g. v1.2.3 or dev)."
        type: string
        required: false
        default: "dev"
  workflow_dispatch:
    inputs:
      apps:
        description: "JSON array of apps to build."
        type: string
        required: false
        default: '["grid","prism","pulse","strata","vault"]'
      version:
        description: "Version string stamped into the binary."
        type: string
        required: false
        default: "dev"

permissions:
  contents: read

env:
  GO_VERSION: "1.25.x"
  CGO_ENABLED: "0"

jobs:
  build:
    name: ${{ matrix.app }}-${{ matrix.goos }}-${{ matrix.goarch }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        app: ${{ fromJSON(inputs.apps) }}
        goos: [linux, darwin, windows]
        goarch: [amd64, arm64]
    steps:
      - uses: actions/checkout@v6

      - uses: actions/setup-go@v6
        with:
          go-version: ${{ env.GO_VERSION }}

      - name: Resolve binary name
        id: name
        run: |
          set -euo pipefail
          ext=""
          if [ "${{ matrix.goos }}" = "windows" ]; then ext=".exe"; fi
          base="runtime-${{ matrix.app }}-${{ matrix.goos }}-${{ matrix.goarch }}"
          echo "binary=${base}${ext}" >> "$GITHUB_OUTPUT"

      - name: Build ${{ matrix.app }}
        working-directory: apps/${{ matrix.app }}
        env:
          GOOS: ${{ matrix.goos }}
          GOARCH: ${{ matrix.goarch }}
        run: |
          set -euo pipefail
          version="${{ inputs.version }}"
          go build \
            -trimpath \
            -ldflags "-s -w -X main.version=${version}" \
            -o "../../dist/${{ steps.name.outputs.binary }}" \
            ./cmd/${{ matrix.app }}

      - name: Upload artifact
        uses: actions/upload-artifact@v7
        with:
          name: ${{ steps.name.outputs.binary }}
          path: dist/${{ steps.name.outputs.binary }}
          if-no-files-found: error
          retention-days: 7