feat: add docker deployment

Dockerfile

@@ -0,0 +1,35 @@
+# syntax=docker/dockerfile:1
+
+FROM node:22-alpine AS web-build
+WORKDIR /src/web
+RUN corepack enable && corepack prepare pnpm@10.30.3 --activate
+COPY web/package.json web/pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY web/ ./
+RUN pnpm build
+
+FROM golang:1.24-alpine AS go-build
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY cmd/ ./cmd/
+COPY internal/ ./internal/
+ARG TARGETOS=linux
+ARG TARGETARCH
+RUN if [ -n "$TARGETARCH" ]; then export GOARCH=$TARGETARCH; fi; \
+    CGO_ENABLED=0 GOOS=$TARGETOS go build -o /out/codex-agent-manager ./cmd/codex-agent-manager
+
+FROM alpine:3.22
+WORKDIR /app
+COPY --from=go-build /out/codex-agent-manager /usr/local/bin/codex-agent-manager
+COPY --from=web-build /src/web/dist ./web/dist
+COPY README.md agent.md task_plan.md findings.md progress.md ./
+COPY docs/ ./docs/
+
+ENV CODEX_HOME=/codex-home
+ENV HTTP_ADDR=0.0.0.0:18083
+ENV STATIC_DIR=/app/web/dist
+ENV WORKSPACE_ROOT=/app
+
+EXPOSE 18083
+ENTRYPOINT ["codex-agent-manager"]