✨ Support multiple DHCP ranges via semicolon-separated DHCP_RANGE

[holmboe]

Summary

• Split DHCP_RANGE env var on ; to emit one dhcp-range= line per entry in the dnsmasq Jinja2 template
• Enables multiple subnets served via DHCPv6 relay agents from a single dnsmasq instance
• Fully backward compatible: a single range with no semicolons produces identical output to before

Companion PR

• ✨ Add networkRanges to DHCP for multi-subnet support ironic-standalone-operator#553 — CRD + controller changes to populate the semicolon-separated DHCP_RANGE env var

Test plan

• Verify single DHCP_RANGE=a::1,a::ff,64 (no semicolons) still renders one dhcp-range= line
• Verify DHCP_RANGE=a::1,a::ff,64;b::1,b::ff,64 renders two dhcp-range= lines
• Verify dnsmasq starts successfully with multiple ranges configured

[metal3-io-bot]

Hi @holmboe. Thanks for your PR.

I'm waiting for a metal3-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[lentzi90]

/ok-to-test

[lentzi90]

Seems safe and useful to me
/lgtm

[lentzi90]

/test metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

[tuminoid]

/cc @Rozzii

[Rozzii]

/approve

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Rozzii

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