feat: add custom ipxe bootloader

- add rpm to manage tftpboot ipxe images for cobbler

rpms/unkin-undionly-kpxe/20250712/release

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+1

rpms/unkin-undionly-kpxe/Dockerfile

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+FROM git.unkin.net/unkin/almalinux9-rpmbuilder:latest
+
+# Create output directory for RPMs
+RUN mkdir -p /app/dist
+
+# Set working directory
+WORKDIR /app
+
+ARG PACKAGE_RELEASE
+ENV PACKAGE_RELEASE=${PACKAGE_RELEASE}
+ARG PACKAGE_VERSION
+ENV PACKAGE_VERSION=${PACKAGE_VERSION}
+
+# Copy nfpm.yaml from the context into the container
+COPY resources /app/resources
+
+# Default command to build RPMs
+CMD /app/resources/build.sh

rpms/unkin-undionly-kpxe/resources/build.sh

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+#!/usr/bin/bash
+# clone the repo
+git clone https://github.com/ipxe/ipxe.git
+
+# change into it
+cd ipxe/src
+
+# copy the main.pxi to embed
+cp /app/resources/main.ipxe ./
+
+# build images
+make bin/undionly.kpxe EMBED=main.ipxe
+make bin-x86_64-efi/ipxe.efi EMBED=main.ipxe
+
+# copy to /app
+cp bin/undionly.kpxe /app/
+cp bin-x86_64-efi/ipxe.efi /app/
+
+# build rpm
+nfpm pkg --config /app/resources/nfpm.yaml --target /app/dist --packager rpm

rpms/unkin-undionly-kpxe/resources/main.ipxe

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+#!ipxe
+chain tftp://198.18.19.19/main.ipxe

rpms/unkin-undionly-kpxe/resources/nfpm.yaml

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+# nfpm.yaml
+
+name: unkin-undionly-kpxe
+version: ${PACKAGE_VERSION}
+release: ${PACKAGE_RELEASE}
+arch: amd64
+platform: linux
+section: default
+priority: extra
+description: "iPXE network bootloader"
+maintainer: iPXE
+homepage: https://github.com/ipxe/ipxe
+license: GPL-2.0 license
+
+disable_globbing: false
+
+replaces:
+  - unkin-undionly-kpxe
+
+provides:
+  - undionly.kpxe
+  - ipxe.efi
+
+# Files to include in the package
+contents:
+  - src: /app/ipxe.efi
+    dst: /var/lib/tftpboot/ipxe.efi
+    file_info:
+      mode: 0644
+      owner: root
+      group: root
+  - src: /app/undionly.kpxe
+    dst: /var/lib/tftpboot/undionly.kpxe
+    file_info:
+      mode: 0644
+      owner: root
+      group: root
+
+# Scripts to run during installation/removal (optional)
+scripts:
+  preinstall: ./resources/preinstall.sh
+#   postinstall: ./scripts/postinstall.sh
+#   preremove: ./scripts/preremove.sh
+#   postremove: ./scripts/postremove.sh

rpms/unkin-undionly-kpxe/resources/preinstall.sh

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+#!/usr/bin/bash
+mkdir -p /var/lib/tftpboot