workflow: made Makefile cross platform

server/Makefile

@@ -1,10 +1,27 @@
-NODE_BIN ?= .\node_modules\.bin
+# Not including dev commands as they have issues on Window's Powershell.
+
+# Fixing paths for different platforms
+# https://stackoverflow.com/questions/4058840/makefile-that-distincts-between-windows-and-unix-like-systems
+ifdef OS
+   RM = del /Q
+   FixPath = $(subst /,\,$1)
+else
+   ifeq ($(shell uname), Linux)
+      RM = rm -f
+      FixPath = $1
+   endif
+endif
+
+SEP ?= '\'
+
+# Stands for MODULES_BINARIES, abbreviated to pollute less possible the commands
+M_B ?= $(call FixPath, ./node_modules/.bin/)
 
 lint:
-	$(NODE_BIN)\eslint ./src/** --fix
+	$(M_B)eslint "./{src, tests}/**" --fix
 
 test:
-	$(NODE_BIN)\jest
+	$(M_B)jest
 
 build: lint test
-	$(NODE_BIN)\tsc
+	$(M_B)tsc