refactor: update Docker integration and build process

- Modified docker-compose.yml to allow overriding the image with the MESHCHAT_IMAGE environment variable.
- Enhanced Makefile with new build-docker and run-docker targets for streamlined Docker image creation and execution.
- Updated README.md to reflect changes in Docker build and run commands, providing clearer instructions for users.

Makefile

@@ -1,9 +1,19 @@
-.PHONY: install run develop clean build build-appimage build-exe dist sync-version wheel node_modules python
+.PHONY: install run develop clean build build-appimage build-exe dist sync-version wheel node_modules python build-docker run-docker
 
 PYTHON ?= python
 POETRY = $(PYTHON) -m poetry
 NPM = npm
 
+DOCKER_COMPOSE_CMD ?= docker compose
+DOCKER_COMPOSE_FILE ?= docker-compose.yml
+DOCKER_IMAGE ?= reticulum-meshchatx:local
+DOCKER_BUILDER ?= meshchatx-builder
+DOCKER_PLATFORMS ?= linux/amd64
+DOCKER_BUILD_FLAGS ?= --load
+DOCKER_BUILD_ARGS ?=
+DOCKER_CONTEXT ?= .
+DOCKERFILE ?= Dockerfile
+
 install: sync-version node_modules python
 
 node_modules:
@@ -43,3 +53,20 @@ clean:
 
 sync-version:
 	$(PYTHON) scripts/sync_version.py
+
+build-docker:
+	@if ! docker buildx inspect $(DOCKER_BUILDER) >/dev/null 2>&1; then \
+		docker buildx create --name $(DOCKER_BUILDER) --use >/dev/null; \
+	else \
+		docker buildx use $(DOCKER_BUILDER); \
+	fi
+	docker buildx build --builder $(DOCKER_BUILDER) --platform $(DOCKER_PLATFORMS) \
+		$(DOCKER_BUILD_FLAGS) \
+		-t $(DOCKER_IMAGE) \
+		$(DOCKER_BUILD_ARGS) \
+		-f $(DOCKERFILE) \
+		$(DOCKER_CONTEXT)
+
+run-docker:
+	MESHCHAT_IMAGE="$(DOCKER_IMAGE)" \
+		$(DOCKER_COMPOSE_CMD) -f $(DOCKER_COMPOSE_FILE) up --remove-orphans --pull never reticulum-meshchatx