ci: add macOS act_runner config and setup script for iOS host runner

scripts/runner-config-mac.yaml

@@ -0,0 +1,48 @@
+log:
+  level: info
+
+runner:
+  file: .runner
+  # Keep capacity at 1 — iOS builds are heavy, no benefit running in parallel on one machine
+  capacity: 1
+  envs:
+  env_file: .env
+  timeout: 3h
+  shutdown_timeout: 0s
+  insecure: false
+  fetch_timeout: 5s
+  fetch_interval: 2s
+  github_mirror: ''
+  labels:
+    - "macos-latest:host"
+    - "macos-14:host"
+
+cache:
+  enabled: true
+  # Cache data stored in act_runner working directory
+  dir: ""
+  # Must be the LAN IP of this Mac — job processes connect back to this address.
+  # Run: ipconfig getifaddr en0
+  # Replace with your actual LAN IP before starting the runner.
+  host: "192.168.1.100"
+  port: 8088
+  external_server: ""
+
+container:
+  # Not used — all jobs run on host (macos-latest:host label).
+  # These settings are inert but kept for completeness.
+  network: ""
+  privileged: false
+  options:
+  workdir_parent:
+  valid_volumes: []
+  docker_host: ""
+  force_pull: false
+  force_rebuild: false
+  require_docker: false
+  docker_timeout: 0s
+
+host:
+  # Working directory for host-mode jobs.
+  # If empty, $HOME/.cache/act/ is used.
+  workdir_parent: