Add docker container with toolchain and libraries to build aarch64 binary

docker/Makefile

@@ -0,0 +1,30 @@
+.PHONY: shell
+.PHONY: clean
+
+TOOLCHAIN_NAME=rg35xx-toolchain
+WORKSPACE_DIR := $(shell pwd)/workspace
+
+CONTAINER_NAME=$(shell docker ps -f "ancestor=$(TOOLCHAIN_NAME)" --format "{{.Names}}")
+BOLD=$(shell tput bold)
+NORM=$(shell tput sgr0)
+
+.build: Dockerfile
+	$(info $(BOLD)Building $(TOOLCHAIN_NAME)...$(NORM))
+	mkdir -p ./workspace
+	docker build -t $(TOOLCHAIN_NAME) .
+	touch .build
+
+ifeq ($(CONTAINER_NAME),)
+shell: .build
+	$(info $(BOLD)Starting $(TOOLCHAIN_NAME)...$(NORM))
+	docker run -it --rm -v "$(WORKSPACE_DIR)":/root/workspace $(TOOLCHAIN_NAME) /bin/bash
+else
+shell:
+	$(info $(BOLD)Connecting to running $(TOOLCHAIN_NAME)...$(NORM))
+	docker exec -it $(CONTAINER_NAME) /bin/bash
+endif
+
+clean:
+	$(info $(BOLD)Removing $(TOOLCHAIN_NAME)...$(NORM))
+	docker rmi $(TOOLCHAIN_NAME)
+	rm -f .build