ci: fix mac runner config YAML and simplify setup to copy static config instead of generate+patch

scripts/setup_runner_mac.sh

@@ -52,29 +52,11 @@ echo "Installed: $("$INSTALL_DIR/act_runner" --version)"
 mkdir -p "$WORK_DIR"
 mkdir -p "$(dirname "$CONFIG_PATH")"
 
-# ── generate and patch config ─────────────────────────────────────────────────
-"$INSTALL_DIR/act_runner" generate-config > "$CONFIG_PATH"
-
-# Patch labels, cache host/port, and capacity
-awk -v host="$HOST_IP" -v port="$CACHE_PORT" '
-  /^runner:/          { in_runner=1; in_cache=0 }
-  /^cache:/           { in_cache=1; in_runner=0 }
-  /^[a-z]/ && !/^runner:/ && !/^cache:/ { in_runner=0; in_cache=0 }
-
-  in_runner && /capacity:/  { $0 = "  capacity: 1" }
-  in_runner && /labels:/    { print; skip_labels=1; next }
-  skip_labels && /^  - /    { next }
-  skip_labels && !/^  - /   { skip_labels=0
-                               print "  - \"macos-latest:host\""
-                               print "  - \"macos-14:host\"" }
-
-  in_cache && /enabled:/    { $0 = "  enabled: true" }
-  in_cache && /host:/       { $0 = "  host: \"" host "\"" }
-  in_cache && /port:/       { $0 = "  port: " port; in_cache=0 }
-
-  { print }
-' "$CONFIG_PATH" > "${CONFIG_PATH}.tmp" && mv "${CONFIG_PATH}.tmp" "$CONFIG_PATH"
-echo "Config patched: labels=macos-latest:host, cache=$HOST_IP:$CACHE_PORT"
+# ── install config ────────────────────────────────────────────────────────────
+# Use the checked-in static config and substitute the LAN IP placeholder.
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+sed "s/__HOST_IP__/$HOST_IP/" "$SCRIPT_DIR/runner-config-mac.yaml" > "$CONFIG_PATH"
+echo "Config written: labels=macos-latest:host, cache=$HOST_IP:$CACHE_PORT"
 
 # ── register runner ───────────────────────────────────────────────────────────
 echo "Registering runner '$RUNNER_NAME'..."