Add default image and additional variables which were deleted

This update includes:
Adding the default image configuration at the top of the file.
Including a comprehensive set of variables, including environment-specific configurations, PKR variables, and SSH keys.
Keeping the existing deploy_ood_proxy_node job unchanged.

.gitlab-ci.yml

+default:
+  image: $CI_REGISTRY_IMAGE:latest
+
+variables:
+  CAMPUS_IP: 138.26.48.47
+  CHEAHA_IP: 172.20.10.9
+  TEST_IP: 138.26.49.134
+  ANSIBLE_REMOTE_TMP: "/tmp"
+  AWS_DEFAULT_REGION: "bhm"
+  AWS_HOST: "s3.lts.rc.uab.edu"
+  FF_SCRIPT_SECTIONS: "true"
+  OS_AUTH_TYPE: "v3applicationcredential"
+  OS_AUTH_URL: "https://keystone.cloud.rc.uab.edu:5000/v3"
+  OS_IDENTITY_API_VERSION: "3"
+  OS_INTERFACE: "public"
+  OS_REGION_NAME: "bhm1"
+  OOD_INSTANCE_NETWORK: "knightly-network"
+  PKR_VAR_flavor: "m1.medium-ruffner"
+  PKR_VAR_source_image: "CentOS-7-x86_64-GenericCloud-2009"
+  PKR_VAR_floating_ip_network: "uab-campus"
+  PKR_VAR_security_groups: '["allow-ssh"]'
+  PKR_VAR_skip_create_image: "false"
+  PKR_VAR_ssh_username: "centos"
+  PKR_VAR_networks: '["8cf2f12e-905d-46d9-bc70-b0897c65f75a"]'
+  PKR_VAR_image_membership: '["cf6fa1e53d4c40a49f4e0e469c440359"]'
+  GIT_AUTHOR_NAME: "Gitlab runner"
+  GIT_AUTHOR_EMAIL: "gitlab@runner"
+  NUM_SERVER_TO_KEEP: 1
+  NUM_IMAGE_TO_KEEP: 30
+  TIMESTAMP_REGEXP: '[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{6}'
+  PKR_VAR_root_ssh_key: "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAFqqWgmYpEaGtHBeTu27ntVJpYjwq/x5aBefrvfhk8Z9lE3cuZ26vJ9n/9tGE4Zn2Pew1mpZgi6PzfJ3vMt8yA= root@master"
+  DEV_KEY: "ssh-rsa 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 louistw@uab.edu"
+
 stages:
   - deploy