Add docs.

docs/k3s_infrastructure_activity_diagram.puml

@@ -0,0 +1,84 @@
+@startuml K3s Infrastructure Deployment Workflow
+skinparam ConditionEndStyle hline
+
+title K3s Kubernetes Cluster Deployment Workflow
+
+|#AntiqueWhite|Client|
+|#LightBlue|Terraform|
+|#PaleGreen|Server Node|
+|#LightSalmon|Worker Nodes|
+
+|Client|
+start
+:Prepare SSH Authentication;
+note right: SSH key pair must be available at the specified path
+
+|Terraform|
+:Read Input Variables (Dev Environment);
+note right: server_ip, worker_ips, ssh_user, ssh_private_key, and other parameters
+
+:Setup SSH Config;
+note right: Creates temporary SSH config for secure connections
+
+|Server Node|
+:Install K3s Server;
+note right
+  Uses curl to download and run K3s installer
+  Configures node as a Kubernetes server
+end note
+
+:Store Kubeconfig;
+:Generate Node Token;
+note right: Required for worker nodes to join the cluster
+
+|Terraform|
+:Retrieve K3s Kubeconfig;
+note right
+  Gets k3s.yaml configuration
+  Makes it accessible locally
+  Updates server URL in config
+end note
+
+:Retrieve Node Token;
+note right: Securely transfer the token to local environment
+
+|Worker Nodes|
+fork
+  :Worker Node 1;
+  note right: For each worker node in parallel
+fork again
+  :Worker Node 2;
+end fork
+
+|Terraform|
+:Copy Node Token to Workers;
+note right: Securely transfer the join token to each worker
+
+|Worker Nodes|
+fork
+  :Install K3s Agent (Worker 1);
+  note right
+    Installs K3s in agent mode
+    Connects to server using token
+    Registers as a worker node
+  end note
+fork again
+  :Install K3s Agent (Worker 2);
+end fork
+
+|Terraform|
+:Cluster is Ready;
+note right
+  All nodes are provisioned
+  Kubeconfig is available locally
+  Cluster can be accessed via kubectl
+end note
+
+|Client|
+:Access Kubernetes Cluster;
+note right: Using generated kubeconfig at ~/.kube/config or as specified
+
+stop
+
+footer Infrastructure Deployment Process - Version 1.0
+@enduml