Blink an ESP8266 board via an arduino-cli CI/CD pipeline hosted on Gitlab.com, with Kubernetes, and a Raspberry-pi board. WARNING: This replaces the "MCU Immutable Booting" talk from Michael Schloh von Bennewitz, which was canceled since the speaker could not attend FOSDEM due to a lack of financial sponsorship. It was about protecting microcontroller bootloaders with immutable boot. In this live demo, I will show how to blink an ESP8266 board via a CI/CD pipeline hosted on Gitlab.com. Gitlab-ci is connected to a stripped down Kubernetes cluster (K3S fork) hosted on a local raspberry-pi board, to which we have attached an ESP8266 board. I will explain how to use the new Arduino CLI instead of the Arduino IDE.