Starts an overview lab (#350)

TL;DR
-----

Provides a stub for a new overview-style lab

Details
-------

Implements a stub track for "Meeting the Replicated Platform", a new lab
that vendors can use to discover the Replicated Platform. The lab will
cover some of the same steps as an overview demo to familiarize vendors
with the Platform on their own.

instruqt/meet-the-platform/01-accessing-the-platform/assignment.md

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+---
+slug: accessing-the-platform
+id: umt7hoxqedg2
+type: challenge
+title: The Replicated Platform
+teaser: Learn abot and connect to the Replicated Platform
+notes:
+- type: text
+  contents: |
+    The Replicated Platform supports your team throughout the [Commercial
+    Software Distribution
+    Lifecycle](https://youtu.be/FtcnUKQuteU?feature=shared). Your primary
+    interface to the Platform is the Replicated Vendor Portal. This lab
+    will introduce you to the Platform and show you how to access the Vendor
+    Portal.
+tabs:
+- id: kp9tdilwjwt0
+  title: Shell
+  type: terminal
+  hostname: shell
+difficulty: basic
+timelimit: 600
+---
+
+The Replicated Platform is a unified platform bringing together everything you
+need to navigate your Commercial Software Distribution Lifecycle. You use the
+platform to efficiently manage, test, install, support, and measure the
+distribution of your app. The Replicated Vendor Portal provides the interfaces
+you need to work with the Platform from the web, the command-line, and
+anywhere you can invoke its APIs.
+
+This lab will introduce you to the Replicated Platform through the Vendor
+Portal. After getting to know the Vendor Portal, you'll take the role of the
+customers and install [SlackerNews](https://slackernews.io), an application
+distributed with Replicated. From there, we'll show you how you'll work with
+customers having a support issue, and how they'll install a fix.

instruqt/meet-the-platform/01-accessing-the-platform/check-shell

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+#!/bin/sh
+#
+# This script runs when the platform check the challenge.
+#
+# The platform determines if the script was successful using the exit code of this
+# script. If the exit code is not 0, the script fails. 
+#
+
+echo "This is the check script"
+
+exit 0

instruqt/meet-the-platform/01-accessing-the-platform/cleanup-shell

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+#!/bin/sh
+#
+# This script runs when the platform cleanup the challenge.
+#
+# The platform determines if the script was successful using the exit code of this
+# script. If the exit code is not 0, the script fails. 
+#
+
+echo "This is the cleanup script"
+
+exit 0

instruqt/meet-the-platform/01-accessing-the-platform/setup-shell

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+#!/bin/sh
+#
+# This script runs when the platform setup the challenge.
+#
+# The platform determines if the script was successful using the exit code of this
+# script. If the exit code is not 0, the script fails. 
+#
+
+echo "This is the setup script"
+
+exit 0

instruqt/meet-the-platform/01-accessing-the-platform/solve-shell

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+#!/bin/sh
+#
+# This script runs when the platform solve the challenge.
+#
+# The platform determines if the script was successful using the exit code of this
+# script. If the exit code is not 0, the script fails. 
+#
+
+echo "This is the solve script"
+
+exit 0

instruqt/meet-the-platform/config.yml

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+version: "3"
+containers:
+- name: shell
+  image: gcr.io/kots-field-labs/shell:main
+  shell: tmux new-session -A -s shell su - replicant
+virtualmachines:
+- name: node
+  image: kots-field-labs/future-node
+  shell: /bin/bash
+  machine_type: n2d-standard-4
+  allow_external_ingress:
+  - http
+  - https
+  - high-ports

instruqt/meet-the-platform/track.yml

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+slug: meet-the-platform
+id: bocfnxay34uj
+title: Meet the Replicated Platform
+teaser: |-
+  A template track for sharing the shell environment across
+  challenges
+description: |-
+  This track is a template track to build any lab that requires
+  maintaining the shell and it's environment between challenges.
+
+  To use it, run:
+
+  ```
+  instruqt track create --title [NEW TRACK TITLE] \
+    --from shared-env-template
+  ```
+
+  The track provides both a shell and a single-node cluster, and
+  the learner runs their commands as the user `replicant`.
+
+  Another advantage of this template is that you can check what
+  the learner has typed into their shell by capturing the `tmux`
+  pane content and running a grep against it, see the sample
+  check script in the first challenge for an example.
+icon: https://storage.googleapis.com/instruqt-frontend/img/tracks/default.png
+tags:
+- template
+owner: replicated
+developers:
+- [email protected]
+maintenance: true
+idle_timeout: 300
+timelimit: 1200
+lab_config:
+  overlay: false
+  width: 25
+  position: right
+  sidebar_enabled: true
+  feedback_recap_enabled: true
+  feedback_tab_enabled: false
+  loadingMessages: true
+  hideStopButton: false
+checksum: "11533550873014008068"

instruqt/meet-the-platform/track_scripts/setup-node

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+#!/usr/bin/env bash
+
+# This set line ensures that all failures will cause the script to error and exit
+set -euxo pipefail
+
+# simple SSH client setup so we can SSH to/from the shell
+
+cat <<EOF >> "$HOME/.ssh/config"
+Host *
+    StrictHostKeyChecking no
+    UserKnownHostsFile /dev/null
+    PubkeyAcceptedKeyTypes +ssh-rsa
+EOF
+
+while ! ssh shell true; do
+  echo "Waiting for container SSH to be available..."
+  sleep 1
+done
+
+# use our shared libary in setup scripts
+curl -s -o /etc/profile.d/header.sh https://raw.githubusercontent.com/replicatedhq/replicated-field-labs/main/libs/header.sh
+source /etc/profile.d/header.sh
+
+api_token=$(get_api_token)
+app_slug=$(get_app_slug)
+app_id=$(get_app_id)
+replicated_sdk_version=$(get_replicated_sdk_version)
+embedded_cluster_version=$(get_embedded_cluster_version)
+
+agent variable set USERNAME $(get_username)
+agent variable set PASSWORD $(get_password)
+agent variable set SLACKERNEWS_DOMAIN $(get_slackernews_domain)
+agent variable set REPLICATED_API_TOKEN ${api_token}
+agent variable set REPLICATED_APP ${app_slug}
+agent variable set REPLICATED_SDK_VERSION ${replicated_sdk_version}
+agent variable set EMBEDDED_CLUSTER_VERSION ${embedded_cluster_version}