Docker image to build elastic/beats for Raspberry Pi

The image has a couple of ENV vars that can be used for customizing what and how to build:

• GOARCH=amd64 - Architecture run condiner on build
• GOARM=7 - ARM architecture version - 7 for RasperryPi 3
• GOOS=linux - OS system
• ARCHGO=arm - the target architecture, arm for RaspberryPi - EXT (386 amd64 arm ppc64 ppc64le)
• BEATS=filebeat,metricbeat - comma-separated list of beats to compile
• BEATS_VERSION=7.2.0 - version to compile

This command will output the build result in the current folder:

docker run -v $(pwd):/build -e BEATS_VERSION=7.2.0 -e GOOS=linux -e ARCHGO=arm denizzzzp/beats4piext