docs: document gitproxy GITHUB_MIRROR and GITPROXY_ADDRESS

[igorpecovnik]

Documents the newly added gitproxy value for GITHUB_MIRROR and the companion GITPROXY_ADDRESS switch.

gitproxy routes all GitHub source clones through a pass-through git proxy whose full base URL is given in GITPROXY_ADDRESS. It is auto-selected when a self-hosted CI runner exports GITPROXY_ADDRESS (sourced from the NetBox git_proxy custom field via github-runners.jq).

Related changes:

• armbian/build: gitproxy case + auto-select in main-config.sh, GITPROXY_ADDRESS forwarded into the build container
• armbian/os: runner-info step exports git_proxy as GITPROXY_ADDRESS
• armbian/armbian.github.io: git_proxy field added to github-runners.jq

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Reviewing files that changed from the base of the PR and between 114ef02 and 75b326b.

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• docs/Developer-Guide_Build-Switches.md

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Walkthrough

This PR updates the Developer Guide documentation for build switches. The GITHUB_MIRROR parameter now includes a new gitproxy option that enables pass-through git proxy functionality. A corresponding GITPROXY_ADDRESS parameter has been documented to specify the full base URL used to replace https://github.com during source clones. The changes expand the existing mirror configuration options within the build documentation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/gitproxy-mirror

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