build: add Windows support for Makefile (#233)

Signed-off-by: Labreo <74888611+Labreo@users.noreply.github.com>

Makefile

@@ -1,14 +1,33 @@
 GO := go
 BIN_DIR := bin
-BIN := $(BIN_DIR)/pmg
-SHELL := /bin/bash
+
+# Platform detection
+ifeq ($(OS),Windows_NT)
+	BINARY_EXT := .exe
+	# Detect if we are in a Unix-like shell on Windows (e.g. Git Bash)
+	# If 'uname' is available, we assume a Unix-like shell
+	ifneq ($(shell uname -s 2>/dev/null),)
+		MKDIR_P := mkdir -p $(BIN_DIR)
+		RM_RF := rm -rf $(BIN_DIR)
+	else
+		MKDIR_P := if not exist $(BIN_DIR) mkdir $(BIN_DIR)
+		RM_RF := if exist $(BIN_DIR) rmdir /s /q $(BIN_DIR)
+	endif
+else
+	BINARY_EXT :=
+	MKDIR_P := mkdir -p $(BIN_DIR)
+	RM_RF := rm -rf $(BIN_DIR)
+	SHELL := /bin/bash
+endif
+
+BIN := $(BIN_DIR)/pmg$(BINARY_EXT)
 GITCOMMIT := $(shell git rev-parse HEAD)
 VERSION := "$(shell git describe --tags --abbrev=0)-$(shell git rev-parse --short HEAD)"
 
 GO_CFLAGS=-X 'github.com/safedep/pmg/internal/version.Commit=$(GITCOMMIT)' -X 'github.com/safedep/pmg/internal/version.Version=$(VERSION)'
 GO_LDFLAGS=-ldflags "-w $(GO_CFLAGS)"
 
-.PHONY: all
+.PHONY: all pmg create_bin clean test
 
 all: pmg
 
@@ -16,10 +35,10 @@ pmg: create_bin
 	$(GO) build ${GO_LDFLAGS} -o $(BIN) main.go
 
 create_bin:
-	mkdir -p $(BIN_DIR)
+	$(MKDIR_P)
 
 clean:
-	rm -rf $(BIN_DIR)
+	$(RM_RF)
 
 test:
 	go test ./...