Add support to create custom AMI

examples/custom-image/README.md

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+# Create Custom Image on Public Cloud
+
+This script automates the creation of a custom image on a public cloud provider (e.g., AWS). The script reads configuration values, manages required credentials, and invokes appropriate cloud-specific build commands.
+
+## Prerequisites
+
+1. **Dependencies**
+   - Bash (Unix/Linux environment)
+   - Packer CLI (https://developer.hashicorp.com/packer/install?product_intent=packer)
+
+2. **Access and Credentials**
+   - Ensure valid credentials for your target cloud provider.
+   - For AWS, configure the `aws_access_key` and `aws_secret_key` in the configuration file i.e. custom-image-config.
+   - Permissions to create and manage images for the chosen cloud provider.
+
+3. **Configuration File**
+    - **Global Configuration (`custom-image-config`)**:
+     Contains details about the cloud provider's credentials.
+   - **Cloud-Specific Configuration (`<cloud-provider>/<os-version>.json`)**:
+     Specifies the instance details for the cloud provider.
+
+## Usage
+
+1. Prepare the Configuration Files:
+    Create the custom-image-config file in the project root directory with the required credentials.
+    Add the appropriate cloud-specific configuration file in the <cloud-provider>/ directory
+
+2. Run the Build Script: Execute the build-custom-image.sh script with the desired cloud provider:
+    ```bash
+    cd examples/custom-image
+    ./build-custom-image.sh <cloud provider>
+
+    eg: ./build-custom-image.sh aws

examples/custom-image/build-custom-image.sh

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+#!/bin/bash
+set -x
+# aws credentials
+cloud_provider=$1
+export PACKER_LOG=1
+source ./custom-image-config
+build_aws_ami() {
+    packer init cloud/aws/config.pkr.hcl
+    packer build --var-file=cloud/aws/ubuntu-2204.json cloud/aws/packer.json
+}
+# Not implemented yet
+build_azure_vhd() {
+    packer init cloud/azure/config.pkr.hcl
+    packer build --var-file=cloud/azure/ubuntu-2204.json cloud/azure/packer.json
+}
+
+if [ "$cloud_provider" == "aws" ]; then
+    export AWS_BUILD_ACCESS_KEY=${aws_access_key}
+    export AWS_BUILD_SECRET_KEY=${aws_secret_key}
+    build_aws_ami
+elif [ "$cloud_provider" == "azure" ]; then
+    export AZURE_BUILD_CLIENT_ID=${azure_client_id}
+    export AZURE_BUILD_CLIENT_SECRET=${azure_client_secret}
+    export AZURE_BUILD_TENANT_ID=${azure_tenant_id}
+    export AZURE_BUILD_SUBSCRIPTION_ID=${azure_subscription_id}
+    build_azure_vhd
+fi

examples/custom-image/cloud/aws/config.pkr.hcl

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+packer {
+  required_plugins {
+    amazon = {
+      version = ">= 1.2.8"
+      source  = "github.com/hashicorp/amazon"
+    }
+    ansible = {
+      version = ">= 1.1.0"
+      source  = "github.com/hashicorp/ansible"
+    }
+    goss = {
+      version = "~> 3"
+      source  = "github.com/YaleUniversity/goss"
+    }
+  }
+}

examples/custom-image/cloud/aws/packer.json

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+{
+  "builders": [{
+    "type": "amazon-ebs",
+    "region": "{{ user `aws_region` }}",
+    "source_ami": "{{user `source_ami`}}",
+    "instance_type": "{{user `builder_instance_type`}}",
+    "ssh_username": "{{user `ssh_username`}}",
+    "ami_name": "{{user `ami_name`}}",
+    "source_ami_filter": {
+      "filters": {
+        "architecture": "x86_64",
+        "name": "{{user `ami_filter_name`}}",
+        "root-device-type": "ebs",
+        "virtualization-type": "hvm"
+      },
+      "most_recent": true,
+      "owners": "{{user `ami_filter_owners`}}"
+    },
+    "vpc_id": "{{ user `vpc_id` }}",
+    "subnet_id": "{{ user `subnet_id` }}"
+  }],
+
+"provisioners": [
+  {
+    "type": "shell",
+    "inline": [
+      "set -e", 
+      "sudo apt update -y || (echo 'APT Update Failed'; exit 1)",
+      "sudo apt install -y bash systemd rsync rsyslog jq zstd conntrack systemd-timesyncd || (echo 'APT Install Failed'; exit 1)"
+    ]
+  },
+  {
+    "type": "shell",
+    "inline": [
+      "curl -fsSL -o /tmp/palette-agent-install.sh https://github.com/spectrocloud/agent-mode/releases/download/v4.5.11-rc.1/palette-agent-install.sh",
+      "chmod +x /tmp/palette-agent-install.sh",
+      "sudo /tmp/palette-agent-install.sh"
+    ]
+  }
+]
+}

examples/custom-image/cloud/aws/ubuntu-2204.json

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+{
+  "ami_filter_name": "ubuntu/images/*ubuntu-jammy-22.04-amd64-server-*",
+  "ami_filter_owners": "099720109477",
+  "build_name": "ubuntu-22.04",
+  "distribution": "Ubuntu",
+  "distribution_release": "jammy",
+  "distribution_version": "22.04",
+  "root_device_name": "/dev/sda1",
+  "source_ami": "",
+  "ssh_username": "ubuntu",
+  "aws_region": "us-east-2",
+  "ami_name": "spectro-agent-mode-ubuntu2204-ami-{{timestamp}}",
+  "builder_instance_type": "t2.medium",
+  "vpc_id": "vpc-xxxxxxx",
+  "subnet_id": "subnet-xxxxxxx"
+}

examples/custom-image/custom-image-config

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+### aws
+aws_access_key="ASIASO6J6QHXBB6MEXOL"
+aws_secret_key="T27xJQWo9Jj3bxOWGHyXIEqIjVcs2IoA0hZpuf5z"
+
+#### azure
+#### NOT SUPPORTED YET
+azure_client_id=""
+azure_client_secret=""
+azure_tenant_id=""
+azure_subscription_id=""