First test

.buildbot/openwrt/Dockerfile

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+FROM ubuntu:focal
+
+RUN apt -y update
+RUN apt -y install build-essential
+RUN apt -y install git-core subversion mercurial build-essential libssl-dev libncurses5-dev unzip gawk zlib1g-dev

.buildbot/openwrt/build.sh

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+#!/bin/bash
+
+git clone https://git.openwrt.org/openwrt/openwrt.git
+
+cd openwrt
+./scripts/feeds update -a
+./scripts/feeds install -a
+
+# wget https://downloads.openwrt.org/releases/21.02.1/targets/ath79/generic/config.buildinfo -O .config
+wget https://downloads.openwrt.org/releases/22.03.2/targets/bcm27xx/bcm2711/config.buildinfo -O .config
+make defconfig
+
+# check RTC
+
+# kmod-rtc-ds1307