docker: build emulator image and push it to registry

.dockerignore

@@ -1 +1,4 @@
 _attic/
+build
+build-docker
+docs

.gitlab-ci.yml

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+image: docker:latest
+
+services:
+  - docker:dind
+
+build and push emulator image:
+  when: manual
+  before_script:
+    - docker login $CI_REGISTRY -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
+  script:
+    - docker build -t ${CI_REGISTRY_IMAGE}/trezor-emulator:latest -f ./docker/emulator/Dockerfile .
+    - docker push ${CI_REGISTRY_IMAGE}/trezor-emulator:latest

docker/emulator/Dockerfile

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+FROM python:3.7.1-stretch
+
+WORKDIR /trezor-emulator
+
+COPY ./ /trezor-emulator
+RUN make vendor
+
+RUN apt-get update
+RUN apt-get install libusb-1.0-0
+
+RUN pip3 install scons trezor
+RUN make build_unix_noui
+
+ENTRYPOINT ["emulator/run.sh"]
+EXPOSE 21324/udp 21325

docker/emulator/run.sh

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+#!/bin/bash
+cd "$(dirname "$0")"
+cd ..
+
+export TREZOR_UDP_IP=0.0.0.0
+
+source emu.sh