Add build scripts

package/Dockerfile

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+FROM golang:1.15.11 as build
+ENV GIT_COMMIT="5049a746da959ae521526d9b672a162c2fef3959"
+ENV GIT_BRANCH="dev"
+RUN \
+    mkdir -p /go/src/github.com/rancher/ && \
+    cd /go/src/github.com/rancher/ && \
+    git clone --depth=1 --branch ${GIT_BRANCH} https://github.com/niusmallnan/steve.git && \
+    cd steve && \
+    git reset --hard ${GIT_COMMIT} && \
+    go mod vendor && \
+    CGO_ENABLED=0 go build -ldflags "-X github.com/rancher/steve/pkg/ui.UIOffline=true -extldflags -static -s" -o /steve
+
+FROM alpine:3.13
+
+ENV CATTLE_DASHBOARD_UI_VERSION v2.5.8-rc3
+
+RUN apk -U --no-cache add bash curl ca-certificates && \
+    mkdir -p /usr/share/rancher/ui-dashboard/dashboard && \
+    cd /usr/share/rancher/ui-dashboard/dashboard && \
+    curl -sL https://releases.rancher.com/dashboard/${CATTLE_DASHBOARD_UI_VERSION}.tar.gz | tar xvzf - --strip-components=2 && \
+    ln -s dashboard/index.html ../index.html
+
+COPY --from=build /steve /usr/bin/steve
+COPY entrypoint.sh /usr/bin
+# Hack to make golang do files,dns search order
+ENV LOCALDOMAIN=""
+ENTRYPOINT ["entrypoint.sh"]

package/entrypoint.sh

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+#!/bin/bash
+
+/usr/bin/steve --ui-path /usr/share/rancher/ui-dashboard "${@}"