[CI] use only platform name to provide user-friendly build name in the summary script

.github/workflows/github.yml

@@ -374,7 +374,6 @@ jobs:
       id: make_partial_json
       env:
         PLATFORM: ${{ matrix.platform }}
-        ARCH: ${{ matrix.arch }}
         ARTIFACT_URL: ${{ steps.upload_artifact.outputs.artifact-url }}
         DEBUG_SYMBOLS_URL: ${{ steps.upload_symbols.outputs.artifact-url }}
         AAB_URL: ${{ steps.upload_aab.outputs.artifact-url }}

CI/emit_partial.py

@@ -77,10 +77,8 @@ def parse_sccache(text: str) -> Tuple[int, int]:
     return hits, misses
 
 
-def arch_label(platform: str, arch_env: Optional[str]) -> str:
-    """Produce a nice arch label; prefer ARCH env when present."""
-    if arch_env:
-        return arch_env
+def arch_label(platform: str) -> str:
+    """Produce a nice arch label."""
     mapping = {
         "mac-intel": "Intel",
         "mac-arm": "Apple Silicon",
@@ -100,7 +98,7 @@ def arch_label(platform: str, arch_env: Optional[str]) -> str:
 def main() -> int:
     # Prefer our explicit PLATFORM env; fall back to VS's "Platform" on Windows if needed.
     platform = os.getenv("PLATFORM") or os.getenv("Platform") or "unknown"
-    arch = arch_label(platform, os.getenv("ARCH"))
+    arch = arch_label(platform)
     tool, cmd, family = detect(platform)
 
     stats_raw = run(cmd)
@@ -137,4 +135,4 @@ def main() -> int:
 
 
 if __name__ == "__main__":
-    sys.exit(main())
+    sys.exit(main())