docs: add documentation for Orka Packer

orka/templates/README.md

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+# Using Packer with Orka
+
+## Pre-requisites
+
+You need to install Packer in your local machine. You can find the installation instructions [here](https://learn.hashicorp.com/tutorials/packer/get-started-install-cli).
+
+Once installed, you can verify the installation by running the following command:
+
+```shell
+packer --version
+```
+
+While writing this document, the latest version of Packer is `1.11.2`.
+
+## Install dependencies
+
+You need to run the following command to install the dependencies:
+
+```shell
+packer init .
+```
+
+## Access the Orka environment
+
+You need to connect to the Orka VPN. You can find the instructions in the secrets repository. 
+
+## Load the environment variables
+
+You need to load the environment variables:
+
+1. Get the `.env` file from the secrets repository. You will find the instructions in the repository.
+2. Copy the `.env` file to this directory.
+3. Run the following command:
+    ```shell
+    source .env
+    ```
+4. Verify that the environment variables are loaded by running the following command:
+    ```shell
+    echo $ORKA_ENDPOINT
+    echo $ORKA_AUTH_TOKEN
+    echo $SSH_USERNAME
+    echo $SSH_PASSWORD
+    ```
+
+## Validate the template
+
+You can validate all the templates by running the following command:
+
+```shell
+packer validate -var "orka_endpoint=$ORKA_ENDPOINT" -var "orka_auth_token=$ORKA_AUTH_TOKEN" -var "ssh_username=$SSH_USERNAME" -var "ssh_password=$SSH_PASSWORD" .
+```
+
+You can validate a specific template by running the following command:
+
+```shell
+packer validate -var "orka_endpoint=$ORKA_ENDPOINT" -var "orka_auth_token=$ORKA_AUTH_TOKEN" -var "ssh_username=$SSH_USERNAME" -var "ssh_password=$SSH_PASSWORD" <template_name>
+```
+
+## Build the image
+
+You can build all the templates by running the following command:
+
+```shell
+packer build -var "orka_endpoint=$ORKA_ENDPOINT" -var "orka_auth_token=$ORKA_AUTH_TOKEN" -var "ssh_username=$SSH_USERNAME" -var "ssh_password=$SSH_PASSWORD" .
+```
+
+You can build a specific template by running the following command:
+
+```shell
+packer build -var "orka_endpoint=$ORKA_ENDPOINT" -var "orka_auth_token=$ORKA_AUTH_TOKEN" -var "ssh_username=$SSH_USERNAME" -var "ssh_password=$SSH_PASSWORD" <template_name>
+```
+
+## Continuous Integration
+
+The templates are initialized and validated in the CI pipeline using GitHub Actions. The pipeline runs on every push to the repository that modifies the templates. You can find the pipeline in the `.github/workflows/orka-templates.yml` directory.
+
+We don't plan to build the images in the CI pipeline. The images are built manually by the team once the PRs are merged or just before merged.