fix: manage dns alias in radixconfig file

[Richard87]

No description provided.

[Copilot]

Pull request overview

This PR restructures Radix application configuration to support managing dnsAlias via generated Radix config files, and updates the build/CI toolchain accordingly.

Changes:

• Replaced the single radixconfig.yaml with a template (radixconfig.tpl.yaml) and multiple generated Radix config variants (radixconfig.*.yaml) containing dnsAlias.
• Added make radixconfigs and wired it into make generate/verify-generate to keep generated configs in sync.
• Updated Go/tooling versions and adjusted CI to validate the new Radix config files.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
radixconfig.yaml	Removed the previous single Radix config file.
radixconfig.tpl.yaml	Added a template Radix config with dnsAlias driven by ${ENV} substitution.
radixconfig.{dev,c2,c3,platform,playground}.yaml	Added generated Radix config files with concrete dnsAlias.environment values.
Makefile	Added a generation target for Radix configs and included it in generate.
go.mod	Bumped Go version directive.
Dockerfile	Updated builder image to Go 1.26.0.
.github/workflows/pr.yaml	Updated actions versions, lint version, and changed Radix config validation to validate multiple config files.

Comments suppressed due to low confidence (1)

.github/workflows/pr.yaml:17

• The GitHub Actions expression uses unusual whitespace (${{ github. sha }}). While it may still parse, it’s easy to misread and looks like a typo. Prefer the standard ${{ github.sha }} for clarity/consistency.

        env:
          REF: ${{ github. sha }}
        run: docker build -t radix-github-webhook:${REF##*/} .

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