fix: Run exec commands only on container that is nginx-ingress

[mrajagopal]

Proposed changes

This PR addresses GitHub Issue 213.
When a customer deploys an NGINX Ingress Controller (NIC) pod with NGINX App-Protect (NAP) the exec commands such as nginx -T and ./nginx-ingress version throw an error when run in containers that are not nginx-ingress such as waf-enforcer and waf-config-mgr.

This PR fixes it by running the exec commands against the target container instead of all containers in the pod.
This fix only addresses the scenario for NGINX Ingress Controller (NIC), other products to follow in later PRs with further testing.

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[Copilot]

Pull Request Overview

This PR fixes an issue where exec commands were being run against all containers in NGINX Ingress Controller pods, causing errors when executed in non-nginx-ingress containers like waf-enforcer and waf-config-mgr. The fix adds a container name check to ensure commands only run against the nginx-ingress container.

• Added container name filtering to restrict exec commands to the nginx-ingress container only
• Fixed missing closing braces in the control flow structure
• Applied the fix consistently across all four job definitions in the NIC job list

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[dareste]

All good. I am getting a permission denied for the job that outputs the content of /etc/nginx-agent/nginx-agent.cat, but there is little we can do. In scenarios where the instance is connected, we will be able to capture the configuration from the corresponding ConfigMap containing the agent config.