Merge pull request #335 from hypriot/python3

Use python3, update docker-compose 1.25.0

builder/chroot-script.sh

@@ -228,9 +228,9 @@ curl -sSL "https://raw.githubusercontent.com/docker/machine/v${DOCKER_MACHINE_VE
 # install docker-compose
 apt-get install -y \
   --no-install-recommends \
-  python
-curl -sSL https://bootstrap.pypa.io/get-pip.py | python
-pip install "docker-compose==${DOCKER_COMPOSE_VERSION}"
+  python3 python3-pip
+update-alternatives --install /usr/bin/python python /usr/bin/python3.7 2
+pip3 install "docker-compose==${DOCKER_COMPOSE_VERSION}"
 
 # install bash completion for Docker Compose
 curl -sSL "https://raw.githubusercontent.com/docker/compose/${DOCKER_COMPOSE_VERSION}/contrib/completion/bash/docker-compose" -o /etc/bash_completion.d/docker-compose

builder/test-integration/spec/hypriotos-image/docker-compose_spec.rb

@@ -7,7 +7,7 @@
 end
 
 describe command('docker-compose --version') do
-  its(:stdout) { should match /1.23.2/m }
+  its(:stdout) { should match /1.25.0/m }
   its(:exit_status) { should eq 0 }
 end
 

versions.config

@@ -14,5 +14,5 @@ export KERNEL_BUILD="1.20190925+1-1"
 # export KERNEL_VERSION="4.19.75"
 export DOCKER_CE_CHANNEL="stable" # stable, test or edge
 export DOCKER_CE_VERSION="5:19.03.5~3-0~raspbian-buster"
-export DOCKER_COMPOSE_VERSION="1.23.2"
+export DOCKER_COMPOSE_VERSION="1.25.0"
 export DOCKER_MACHINE_VERSION="0.16.2"