Hello Team,

ISO and pxe-files creation is not working in agent based installation.

Both image and pxe-files are not getting created with 4.18.6.

1. ./openshift-install 4.18.6
   built from commit dac97742beeaf409d8089e5f1932dd787709857e
   release image quay.io/openshift-release-dev/ocp-release@sha256:61fdad894f035a8b192647c224faf565279518255bdbf60a91db4ee0479adaa6
   release architecture amd64

1. ./openshift-install agent create image --dir .
   INFO Configuration has 1 master replicas and 0 worker replicas
   INFO Consuming Install Config from target directory
   INFO Consuming Agent Config from target directory
   FATAL failed to write asset (Agent Installer ISO) to disk: cannot generate ISO image due to configuration errors

1. ./openshift-install agent create pxe-files --dir .
   INFO Configuration has 1 master replicas and 0 worker replicas
   ERROR failed to write asset (Agent Installer PXE Files) to disk: cannot generate PXE assets due to configuration errors
   FATAL failed to fetch Agent Installer PXE Files: failed to generate asset "Agent Installer PXE Files": failed to open base initrd: open /tmp/agent1256272200/images/pxeboot/initrd.img: no such file or directory

   ---

Able to create image with "4.18.4" but the pxe-files are not creating and failing as below.

1. ./openshift-install version
   ./openshift-install 4.18.4
   built from commit 409dcb7b6f6ac28195223f58c143d3b63b23a5e8
   release image quay.io/openshift-release-dev/ocp-release@sha256:61dffd292f6689a3381dd05f7845dcd5d27c099fce2f460aa03d760d535f81e6
   release architecture amd64

1. ./openshift-install agent create image --dir .
   INFO Configuration has 1 master replicas and 0 worker replicas
   INFO The rendezvous host IP (node0 IP) is 192.168.111.80
   INFO Extracting base ISO from release payload
   INFO Base ISO obtained from release and cached at [/root/.cache/agent/image_cache/coreos-x86_64.iso]
   INFO Consuming Agent Config from target directory
   INFO Consuming Install Config from target directory
   INFO Generated ISO at agent.x86_64.iso.

1. ./openshift-install agent create pxe-files --dir .
   INFO Configuration has 1 master replicas and 0 worker replicas
   ERROR failed to write asset (Agent Installer PXE Files) to disk: cannot generate PXE assets due to configuration errors
   FATAL failed to fetch Agent Installer PXE Files: failed to generate asset "Agent Installer PXE Files": failed to open base initrd: open /tmp/agent1256272200/images/pxeboot/initrd.img: no such file or directory

   ---

Able to create image and pxe-files with 4.16.

1. ./openshift-install version
   ./openshift-install 4.16.10
   built from commit 0b2e4425f0895ad16097240d98286c2d6c36bc6e
   release image quay.io/openshift-release-dev/ocp-release@sha256:793bac91943944692d72a61c47a3102edb70fb2948cdf54019f06376a87298ad
   release architecture amd64

1. ./openshift-install agent create image --dir .
   INFO Configuration has 1 master replicas and 0 worker replicas
   INFO The rendezvous host IP (node0 IP) is 192.168.111.80
   INFO Extracting base ISO from release payload
   INFO Verifying cached file
   INFO Using cached Base ISO /root/.cache/agent/image_cache/coreos-x86_64.iso
   INFO Consuming Agent Config from target directory
   INFO Consuming Install Config from target directory
   INFO Generated ISO at agent.x86_64.iso.

1. ./openshift-install agent create pxe-files --dir .
   INFO Configuration has 1 master replicas and 0 worker replicas
   INFO The rendezvous host IP (node0 IP) is 192.168.111.80
   INFO Extracting base ISO from release payload
   INFO Verifying cached file
   INFO Base ISO obtained from release and cached at [/root/.cache/agent/image_cache/coreos-x86_64.iso]
   INFO Consuming Agent Config from target directory
   INFO Consuming Install Config from target directory
   INFO PXE boot artifacts created in: boot-artifacts
   INFO Kernel parameters for PXE boot: rw ignition.firstboot ignition.platform.id=metal

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