Add Dockerfile and GHCR publishing workflow

- Multi-stage Dockerfile for wharf-cli and yacht-agent binaries
- Automated publishing to ghcr.io on release
- Build attestation for supply chain security

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

.github/workflows/ghcr-publish.yml

@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+name: Publish to GHCR
+
+permissions: read-all
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+      attestations: write
+
+    strategy:
+      matrix:
+        target:
+          - name: wharf-cli
+            dockerfile-target: wharf-cli
+          - name: yacht-agent
+            dockerfile-target: yacht-agent
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@c47758b77c9736f4b2ef4073d4d51994fabfe349 # v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.target.name }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=ref,event=branch
+            type=sha
+
+      - name: Build and push
+        id: push
+        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6
+        with:
+          context: .
+          target: ${{ matrix.target.dockerfile-target }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@ef244123eb79f2f7a7e75d99086184180e6d0018 # v2
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.target.name }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true

Dockerfile

@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: 2025 hyperpolymath
+
+# Multi-stage Dockerfile for Project Wharf
+# Builds both wharf-cli and yacht-agent binaries
+
+FROM rust:1.83-slim-bookworm AS builder
+
+WORKDIR /build
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy workspace files
+COPY Cargo.toml Cargo.lock ./
+COPY crates/ crates/
+COPY bin/ bin/
+
+# Build release binaries
+RUN cargo build --release
+
+# Runtime image for wharf-cli
+FROM debian:bookworm-slim AS wharf-cli
+
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /build/target/release/wharf /usr/local/bin/wharf
+
+ENTRYPOINT ["wharf"]
+CMD ["--help"]
+
+# Runtime image for yacht-agent
+FROM debian:bookworm-slim AS yacht-agent
+
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /build/target/release/yacht-agent /usr/local/bin/yacht-agent
+
+EXPOSE 3306 33060 9001
+
+ENTRYPOINT ["yacht-agent"]
+CMD ["--help"]