Merge #6890: guix: avoid downloading macOS SDK for non-darwin target HOSTs

d0eb2b5 guix: avoid downloading macOS SDK for non-darwin target HOSTs (UdjinM6)

Pull request description:

  ## Issue being fixed or feature implemented
  Save some time/bandwidth for non-darwin HOSTs.

  See windows build as an example:
  develop: https://github.com/UdjinM6/dash/actions/runs/18493165708/job/52692931975#step:7:78
  this PR: https://github.com/UdjinM6/dash/actions/runs/18494088428/job/52720349586#step:7:76

  ## What was done?

  ## How Has This Been Tested?
  https://github.com/UdjinM6/dash/actions/runs/18494088428

  ## Breaking Changes

  ## Checklist:
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [ ] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  kwvg:
    utACK d0eb2b5

Tree-SHA512: 90050e196402f4e4c785e867fa1143db4471c00715e8c73e2db57b3c779928a0abda0a93a3b992cc470b7b27a4f54d62f20e0e82bd4b3266956e41a7c3df6a9a

Author: PastaPastaPasta

contrib/containers/guix/scripts/guix-start

@@ -9,10 +9,12 @@ if [[ ! -d "${WORKSPACE_PATH}" || ! "${WORKSPACE_PATH}" = /* || ! -f "${WORKSPAC
     exit 1
 fi
 
-export SDK_PATH="${SDK_PATH:-${WORKSPACE_PATH}/depends/SDKs}"
-export SDK_SRCS="${SDK_PATH:-${WORKSPACE_PATH}/depends/sdk-sources}"
+if [[ -z "${HOSTS}" || "${HOSTS}" == *"darwin"* ]]; then
+    export SDK_PATH="${SDK_PATH:-${WORKSPACE_PATH}/depends/SDKs}"
+    export SDK_SRCS="${SDK_PATH:-${WORKSPACE_PATH}/depends/sdk-sources}"
 
-./contrib/containers/guix/scripts/setup-sdk
+    ./contrib/containers/guix/scripts/setup-sdk
+fi
 
 # Add safe.directory option only when WORKSPACE_PATH was specified via cmd-line arguments (happens in CI)
 if [[ -n "${1}" ]]; then