Added support for debian-stretch (aarch64)

Signed-off-by: Boris Pruessmann <boris@pruessmann.org>

contrib/builder/deb/aarch64/debian-stretch/Dockerfile

@@ -0,0 +1,22 @@
+#
+# THIS FILE IS AUTOGENERATED; SEE "contrib/builder/deb/aarch64/generate.sh"!
+#
+
+FROM aarch64/debian:stretch
+
+RUN apt-get update && apt-get install -y apparmor bash-completion btrfs-tools build-essential cmake curl ca-certificates debhelper dh-apparmor dh-systemd git libapparmor-dev libdevmapper-dev libltdl-dev pkg-config vim-common libsystemd-dev golang-go libseccomp-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
+# Install Go
+# aarch64 doesn't have official go binaries, so use the version of go installed from
+# the image to build go from source.
+ENV GO_VERSION 1.7.5
+RUN mkdir /usr/src/go && curl -fsSL https://golang.org/dl/go${GO_VERSION}.src.tar.gz | tar -v -C /usr/src/go -xz --strip-components=1 \
+	&& cd /usr/src/go/src \
+	&& GOOS=linux GOARCH=arm64 GOROOT_BOOTSTRAP="$(go env GOROOT)" ./make.bash
+
+ENV PATH /usr/src/go/bin:$PATH
+
+ENV AUTO_GOPATH 1
+
+ENV DOCKER_BUILDTAGS apparmor pkcs11 selinux seccomp
+ENV RUNC_BUILDTAGS apparmor selinux seccomp

contrib/builder/deb/aarch64/generate.sh

@@ -69,7 +69,7 @@ for version in "${versions[@]}"; do
 			# golang-1.6-go package can be used as bootstrap.
 			packages+=( golang-1.6-go )
 			;;
-		xenial)
+		stretch|xenial)
 			packages+=( libsystemd-dev )
 			packages+=( golang-go libseccomp-dev)