Add GHCR Docker container build for multi-arch binaries

.dockerignore

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+# Build artifacts
+target/
+
+# Version control
+.git/
+.gitignore
+
+# Documentation (not needed for build)
+*.md
+
+# CI/CD
+.github/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Misc
+.DS_Store

.github/workflows/container.yml

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+name: container
+
+on:
+  pull_request:
+  workflow_run:
+    workflows: [Rust]
+    types: [completed]
+    branches: [main]
+  push:
+    tags: ['v*']
+
+permissions:
+  contents: read
+  packages: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'workflow_run' && github.event.workflow_run.head_branch || github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    if: |
+      github.event_name == 'pull_request' ||
+      github.event_name == 'push' ||
+      (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success')
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 45
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: ubuntu-latest
+            platform: linux/amd64
+            arch: amd64
+          - runner: ubuntu-24.04-arm
+            platform: linux/arm64
+            arch: arm64
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.workflow_run.head_sha || '' }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: >-
+            type=image,
+            name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},
+            push-by-digest=true,
+            name-canonical=true,
+            push=${{ github.event_name != 'pull_request' }}
+          cache-from: type=gha,scope=${{ matrix.arch }}
+          cache-to: type=gha,scope=${{ matrix.arch }},mode=max
+
+      - name: Export digest
+        if: github.event_name != 'pull_request'
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        if: github.event_name != 'pull_request'
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.arch }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    if: github.event_name != 'pull_request'
+    needs: build
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=edge,branch=main
+            type=sha,prefix=sha-
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect \
+            $(jq -cr '.tags[0]' <<< "$DOCKER_METADATA_OUTPUT_JSON")

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# =============================================================================
+# Stage 1: Chef - Install cargo-chef for dependency caching
+# =============================================================================
+FROM rust:bookworm AS chef
+RUN cargo install --locked cargo-chef@0.1.77
+WORKDIR /app
+
+# =============================================================================
+# Stage 2: Planner - Generate dependency recipe
+# =============================================================================
+FROM chef AS planner
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+# =============================================================================
+# Stage 3: Builder - Build all workspace binaries
+# =============================================================================
+FROM chef AS builder
+
+# libclang-dev: required by bindgen (build-dep of process crate)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libclang-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Build dependencies first (cached layer)
+COPY --from=planner /app/recipe.json recipe.json
+RUN cargo chef cook --release --recipe-path recipe.json
+
+# Build all workspace binaries
+COPY . .
+RUN cargo build --release
+
+# Collect binaries into staging directory
+RUN mkdir -p /app/staging/bin && \
+    find target/release -maxdepth 1 -type f -executable \
+        ! -name '*.d' ! -name 'build-script-*' \
+        -exec cp {} /app/staging/bin/ \;
+
+# =============================================================================
+# Stage 4: Runtime - Minimal image with binaries
+# =============================================================================
+FROM ubuntu:24.04 AS runtime
+
+LABEL org.opencontainers.image.source="https://github.com/rustcoreutils/posixutils-rs"
+LABEL org.opencontainers.image.licenses="MIT"
+LABEL org.opencontainers.image.description="Rust-native POSIX utilities (130+ commands)"
+LABEL org.opencontainers.image.title="posixutils-rs"
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN useradd --create-home --shell /bin/bash posixutils
+
+COPY --from=builder /app/staging/bin/ /usr/local/bin/
+
+# argv[0]-based symlinks (ex->vi, uncompress/zcat->compress)
+RUN ln -sf vi /usr/local/bin/ex && \
+    ln -sf compress /usr/local/bin/uncompress && \
+    ln -sf compress /usr/local/bin/zcat
+
+USER posixutils
+WORKDIR /home/posixutils
+
+CMD ["sh"]

docker-compose.yml

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+services:
+  posixutils:
+    build: .
+    stdin_open: true
+    tty: true
+    volumes:
+      - .:/workspace:ro
+    working_dir: /workspace