Use Go 1.13 in docs

Go 1.13 is new enough for us, and Go 1.14 is probably too new.

* Amazon Linux 2 doesn't have the version.
* containerd uses bbolt v1.3.3 which doesn't work with Go 1.14

Signed-off-by: Kazuyoshi Kato <[email protected]>

Author: kzys

docs/getting-started.md

@@ -42,7 +42,7 @@ You need to have the following things in order to use firecracker-containerd:
   [described here](https://github.com/firecracker-microvm/firecracker/blob/master/docs/getting-started.md#running-firecracker)
   as `hello-rootfs.ext4`). 
 * A recent installation of [Docker CE](https://docker.com).
-* Go 1.11 or later, which you can download from [here](https://golang.org/dl/).
+* Go 1.13 or later, which you can download from [here](https://golang.org/dl/).
 
 ## Setup
 

docs/quickstart.md

@@ -28,12 +28,14 @@ files into `/usr/local/bin`.
 
 cd ~
 
-# Install git, Go 1.11, make, curl
+# Install git, Go 1.13, make, curl
 sudo mkdir -p /etc/apt/sources.list.d
+echo "deb http://ftp.debian.org/debian buster-backports main" | \
+  sudo tee /etc/apt/sources.list.d/buster-backports.list
 sudo DEBIAN_FRONTEND=noninteractive apt-get update
 sudo DEBIAN_FRONTEND=noninteractive apt-get \
   install --yes \
-  golang-go \
+  golang-1.13 \
   make \
   git \
   curl \
@@ -42,6 +44,9 @@ sudo DEBIAN_FRONTEND=noninteractive apt-get \
   bc \
   gnupg
 
+# Debian's Go 1.13 package installs "go" command under /usr/lib/go-1.13/bin
+export PATH=/usr/lib/go-1.13/bin:$PATH
+
 cd ~
 
 # Install Docker CE