Feat v0.3.8 distribution (#21)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

Dockerfile.builder

@@ -0,0 +1,65 @@
+# ============================================
+# Switchboard Core — Builder Image
+# ============================================
+# Pre-caches Go modules and Node dependencies
+# for faster custom builds. Use as a base in
+# your own Dockerfile to skip dependency
+# download on every build.
+#
+# Usage:
+#   FROM ghcr.io/switchboard-core/builder:latest AS go-builder
+#   COPY server/ /app/
+#   RUN cd /app && go build -o /bin/switchboard .
+#
+# Or build this image locally:
+#   docker build -f Dockerfile.builder -t switchboard-builder .
+# ============================================
+
+# ── Go module cache ─────────────────────────
+FROM golang:1.23-bookworm AS go-cache
+WORKDIR /cache
+COPY server/go.mod server/go.sum* ./
+RUN go mod download && go mod verify
+
+# ── Node dependency cache ───────────────────
+FROM node:20-alpine AS node-cache
+WORKDIR /cache
+
+# Editor bundle dependencies
+COPY src/editor/package*.json ./editor/
+RUN cd editor && npm ci --loglevel=warn
+
+# Vendor libs (same versions as production Dockerfile)
+RUN npm pack marked@16.3.0 && \
+    npm pack dompurify@3.2.4 && \
+    npm pack mermaid@11.4.1 && \
+    npm pack katex@0.16.11 && \
+    mkdir -p /cache/vendor-tarballs && \
+    mv *.tgz /cache/vendor-tarballs/
+
+# ── Final builder image ────────────────────
+FROM golang:1.23-bookworm
+
+# Pre-install build tools
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    zip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Go module cache (populated)
+COPY --from=go-cache /go/pkg/mod /go/pkg/mod
+
+# Node dependencies (for editor bundle builds)
+COPY --from=node-cache /cache/editor/node_modules /cache/editor/node_modules
+
+# Vendor lib tarballs (avoid re-download)
+COPY --from=node-cache /cache/vendor-tarballs /cache/vendor-tarballs
+
+# Node.js for frontend builds
+COPY --from=node-cache /usr/local/bin/node /usr/local/bin/node
+COPY --from=node-cache /usr/local/lib/node_modules /usr/local/lib/node_modules
+RUN ln -sf /usr/local/lib/node_modules/npm/bin/npm-cli.js /usr/local/bin/npm
+
+WORKDIR /build
+
+LABEL org.opencontainers.image.title="Switchboard Core Builder"
+LABEL org.opencontainers.image.description="Pre-cached build dependencies for faster custom Switchboard Core builds"