[feature] Add CI playbook

Playbook to use with ./chi-appliance configure to setup a CI
infrastructure on top of Chameleon nodes.

This playbook:
 - installs gitlab-runner
 - adds role to install or run ci on aml

I'm reluctant to add CI tokens in plaintext inside the infra repo.
Instead, ansible-vault is used to keep them encrypted.

ansible/ci.yaml

+---
+- hosts: all
+  vars_files:
+    - vars/ci-tokens.yaml
+  roles:
+    - common
+    - { role: ci-runner, become: yes }
+    - { role: aml, ci: true, install: false}

ansible/roles/aml/tasks/ci.yaml

+- name: add ci configuration
+  blockinfile:
+    dest: /etc/gitlab-runner/config.toml
+    block: "{{ lookup('template', 'config.gitlab.etc.j2') }}"
+    marker: "# {mark} ANSIBLE MANAGED BLOCK FOR aml"

ansible/roles/aml/tasks/dependencies.yaml

+- name: add aml dependencies
+  package:
+    name: "{{ item }}"
+    state: present
+  with_items:
+    - numactl-devel
+    - hwloc-devel

ansible/roles/aml/tasks/install.yaml

+- name: fetch aml repository
+  git:
+    repo: https://xgitlab.cels.anl.gov/argo/aml.git
+    dest: /argo/aml.git
+    update: yes
+
+- name: compile aml
+  shell: ./autogen.sh && ./configure --prefix=/usr && make && make install
+  args:
+    chdir: /argo/aml.git

ansible/roles/aml/tasks/main.yaml

+- { include: dependencies.yaml, become: yes }
+- { include: install.yaml, become: yes, when: install }
+- { include: ci.yaml, become: yes, when: ci }

ansible/roles/aml/templates/config.gitlab.etc.j2

+[[runners]]
+  name = "CHI/AUTO/aml"
+  url = "https://xgitlab.cels.anl.gov/"
+  token = "{{ aml_ci_token }}"
+  executor = "shell"
+  [runners.cache]
+

ansible/vars/ci-tokens.yaml

+$ANSIBLE_VAULT;1.1;AES256
+39616266613961346337313335393565343662326439326265663631316266363235653661323466
+3365656134326137343030363161363735663364333939360a393034386438323862333663633439
+37363763393963663866326166623837303032363665316131646361396338343334663938343430
+6561613939396438620a373234633238393735646334386539393962643930613830366563316263
+64323834386537663134336266386237316261626264323561333965333066623531613336613734
+36643361363564626333613132313063373636323935343165333936386631613565313764386330
+306166333231373532343265386266383861