add configuration for nimbus.mainnet bootstrap nodes

Signed-off-by: Jakub Sokołowski <jakub@status.im>

ansible/group_vars/nimbus-mainnet-small.yml

@@ -0,0 +1,4 @@
+---
+beacon_node_network: 'mainnet'
+beacon_node_cont_tag: 'master-small'
+beacon_node_web3_url: 'wss://mainnet.infura.io/ws/v3/9e2f2cc13f70432f8b87dbe7d51b81db'

ansible/mainnet.yml

@@ -0,0 +1,14 @@
+---
+- name: Pre-playbook checks
+  hosts: localhost
+  tasks:
+    - name: 'Verify Ansible version is 2.8 or newer'
+      assert:
+        that: 'ansible_version.full is version_compare("2.8", ">=")'
+        msg: 'Your Ansible version is lower than 2.8. Upgrade it.'
+
+- name: Configure network mainnet bootnodes
+  hosts:
+    - nimbus-mainnet-small
+  roles:
+    - { role: infra-role-beacon-node, tags: [ infra-role-beacon-node, beacon-node ] }