fix(ci): trigger fastlane on merged main PRs

Run the Linux amd64 fast-lane after a PR is merged to main, while leaving unmerged PRs as no-ops.

Co-authored-by: JustMe <mr.toing@outlook.com>

ci/main-fastlane.py

@@ -35,6 +35,9 @@ IGNORED_PARTS = {".git", ".release", "artifacts", "bin", "obj", "TestResults", "
 
 def read_changed_files() -> list[str]:
     raw = os.environ.get("CI_PIPELINE_FILES")
+    if os.environ.get("FASTLANE_FILES_FROM_PR_API") == "true":
+        value = json.loads(raw or "[]")
+        return [str(path).replace("\\", "/") for path in value]
     if raw:
         try:
             value = json.loads(raw)