Support for a custom path to Swiftly on GitHub runners

Author: dkovba

vminitd/Makefile

@@ -23,7 +23,7 @@ SWIFT_SDK_PATH := /tmp/$(notdir $(SWIFT_SDK_URL))
 
 SWIFTLY_URL := https://download.swift.org/swiftly/darwin/swiftly.pkg
 SWIFTLY_FILENAME := $(notdir $(SWIFTLY_URL))
-SWIFTLY_BIN_DIR ?= ~/.swiftly/bin
+SWIFTLY_BIN_DIR ?= $(if $(wildcard $(HOME)/.swiftly/bin),$(HOME)/.swiftly/bin,/opt/swiftly/bin)
 SWIFT ?= $(SWIFTLY_BIN_DIR)/swift
 BUILD_BIN_DIR := $(shell $(SWIFT) build -c $(BUILD_CONFIGURATION) $(SWIFT_CONFIGURATION) --show-bin-path)