add docker images for ubuntu 20.04

dockerbuild/Dockerfile.ubuntu-focal

@@ -0,0 +1,14 @@
+FROM ubuntu:focal-20200423
+
+ARG go_pkg_url
+
+RUN apt-get update && apt-get upgrade -y && apt-get -y install build-essential curl cmake ca-certificates devscripts dh-systemd
+
+RUN curl -s -k $go_pkg_url -o go.tar.gz && \
+    tar -C /usr/local -xzf go.tar.gz && \
+    rm go.tar.gz
+
+RUN groupadd -g 1000 jenkins-build && useradd -u 1000 -g 1000 jenkins-build
+RUN chmod 777 /home && mkdir -p /home/jenkins-build && chown jenkins-build:jenkins-build /home/jenkins-build && chmod 777 /home/jenkins-build
+CMD ["/usr/bin/sshd", "-D"]
+

dockerbuild/Makefile

@@ -72,7 +72,7 @@ debian-sid:
 	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-ppc64le.tar.gz" --platform linux/ppc64le -f Dockerfile.debian-sid . -t ztbuild/debian-sid-ppc64le --load
 	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-s390x.tar.gz" --platform linux/s390x -f Dockerfile.debian-sid . -t ztbuild/debian-sid-s390x --load
 
-ubuntu: ubuntu-trusty ubuntu-xenial ubuntu-bionic ubuntu-eoan
+ubuntu: ubuntu-trusty ubuntu-xenial ubuntu-bionic ubuntu-eoan ubuntu-focal
 
 ubuntu-trusty:
 	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-amd64.tar.gz" --platform linux/amd64 -f Dockerfile.ubuntu-trusty . -t ztbuild/ubuntu-trusty-amd64 --load
@@ -105,6 +105,13 @@ ubuntu-eoan:
 	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-ppc64le.tar.gz" --platform linux/ppc64le -f Dockerfile.ubuntu-eoan . -t ztbuild/ubuntu-eoan-ppc64le --load
 	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-s390x.tar.gz" --platform linux/s390x -f Dockerfile.ubuntu-eoan . -t ztbuild/ubuntu-eoan-s390x --load
 
+ubuntu-focal:
+	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-amd64.tar.gz" --platform linux/amd64 -f Dockerfile.ubuntu-eoan . -t ztbuild/ubuntu-eoan-amd64 --load
+	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-arm64.tar.gz" --platform linux/arm64 -f Dockerfile.ubuntu-eoan . -t ztbuild/ubuntu-eoan-arm64 --load
+	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-armv6l.tar.gz" --platform linux/arm/v7 -f Dockerfile.ubuntu-eoan . -t ztbuild/ubuntu-eoan-armhf --load
+	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-ppc64le.tar.gz" --platform linux/ppc64le -f Dockerfile.ubuntu-eoan . -t ztbuild/ubuntu-eoan-ppc64le --load
+	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-s390x.tar.gz" --platform linux/s390x -f Dockerfile.ubuntu-eoan . -t ztbuild/ubuntu-eoan-s390x --load
+
 kali-rolling:
 	@docker buildx build --build-arg go_pkg_url="https://dl.google.com/go/go${GO_VERSION}.linux-amd64.tar.gz" --platform linux/amd64 -f Dockerfile.kali-rolling . -t ztbuild/kali-rolling-amd64 --load