update the README to reflect recent changes

add script to automatically add SSH key pair to main.tf files, for deployments that do require it

update_ssh_keys.sh

@@ -0,0 +1,80 @@
+#!/bin/bash
+
+# Script to automatically update SSH keys in all main.tf files
+# This script looks for terraform_key (or terraform_key.pub) in ~/.ssh directory
+
+# Function to display usage
+usage() {
+    echo "Usage: $0 [ssh_key_name]"
+    echo "  ssh_key_name: Name of the SSH key pair (default: terraform_key)"
+    echo ""
+    echo "Example:"
+    echo "  $0                    # Uses default 'terraform_key'"
+    echo "  $0 my_custom_key      # Uses 'my_custom_key' and 'my_custom_key.pub'"
+    exit 1
+}
+
+# Set the SSH key name (default to terraform_key)
+SSH_KEY_NAME="${1:-terraform_key}"
+
+# Expand the home directory properly  
+HOME_DIR="${HOME:-/home/$(whoami)}"
+SSH_KEY_PATH="$HOME_DIR/.ssh/$SSH_KEY_NAME"
+SSH_KEY_PUB_PATH="$HOME_DIR/.ssh/$SSH_KEY_NAME.pub"
+
+# Check if SSH key exists
+if [ ! -f "$SSH_KEY_PATH" ] && [ ! -f "$SSH_KEY_PUB_PATH" ]; then
+    echo "Error: SSH key '$SSH_KEY_NAME' not found in $HOME_DIR/.ssh/"
+    echo "Please generate your SSH key first:"
+    echo "  ssh-keygen -t rsa -b 4096 -f $HOME_DIR/.ssh/$SSH_KEY_NAME"
+    exit 1
+fi
+
+# Check if public key exists specifically (required for reading)
+if [ ! -f "$SSH_KEY_PUB_PATH" ]; then
+    echo "Error: SSH public key '$SSH_KEY_NAME.pub' not found in $HOME_DIR/.ssh/"
+    exit 1
+fi
+
+# Get the public key content (remove any trailing whitespace)
+PUBLIC_KEY=$(cat "$SSH_KEY_PUB_PATH" | tr -d '\n')
+
+# Validate that we got a valid SSH key
+if [[ ! "$PUBLIC_KEY" =~ ^ssh-[a-z]+[[:space:]]+[A-Za-z0-9+/]*[=]{0,3} ]]; then
+    echo "Error: Invalid SSH public key format detected"
+    exit 1
+fi
+
+echo "Found SSH public key:"
+echo "$PUBLIC_KEY"
+echo ""
+
+# Find all main.tf files and update them
+MAIN_TF_FILES=$(find . -name "main.tf" -type f)
+
+if [ -z "$MAIN_TF_FILES" ]; then
+    echo "No main.tf files found!"
+    exit 1
+fi
+
+echo "Updating SSH key in the following files:"
+echo "$MAIN_TF_FILES"
+echo ""
+
+# Replace the ssh_key line in all main.tf files using # as delimiter
+echo "Replacing SSH key in all main.tf files..."
+for file in $MAIN_TF_FILES; do
+    sed -i "s#ssh_key = \".*\"#ssh_key = \"$PUBLIC_KEY\"#g" "$file"
+done
+
+# Verify the replacement worked
+echo ""
+echo "Verification:"
+for file in $MAIN_TF_FILES; do
+    echo "File: $file"
+    grep "ssh_key =" "$file" | head -1
+done
+
+echo ""
+echo "SSH key has been successfully updated in all main.tf files!"
+echo "Backup files are saved with timestamp suffixes."