Add Dockerfile and requirements.txt to repo.

.devcontainer/python.Dockerfile

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+FROM python:3
+
+WORKDIR /opt/timer
+
+COPY requirements.txt /opt/timer/requirements.txt
+COPY termdown.py /opt/timer/termdown.py
+
+RUN python3 -m pip install --no-cache-dir -r requirements.txt
+
+
+ENTRYPOINT [ "python", "/opt/timer/termdown.py" ]

Makefile

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+.PHONY: help build-image 
+
+CONTAINER_DIR      ?= .devcontainer
+WORK_DIR           ?= $(shell pwd)
+USERNAME           ?= testuser
+USER_UID           ?= 1000
+USER_GID           ?= 1000
+
+IMAGE_NAME         ?= termdown
+CONTAINER_NAME     ?= $(IMAGE_NAME)-$(USERNAME)-$(shell date +"%Y-%m-%d.%H-%M")
+DOCKER_FILE        ?= $(CONTAINER_DIR)/python.Dockerfile
+DOCKER_ENTRYPOINT  ?= 
+SHARED_DIRS        ?= 
+
+
+define BUILD_IMAGE_HELP_INFO
+  build-image 
+    Build the docker image
+endef
+export BUILD_IMAGE_HELP_INFO
+
+build-image:
+	@docker build -t $(IMAGE_NAME)                        \
+		--build-arg DOCKER_ENTRYPOINT=$(DOCKER_ENTRYPOINT)  \
+		--file $(DOCKER_FILE) .
+
+# ============================================================================= #
+
+define RUN_CONTAINER_HELP_INFO
+  run-container
+    Run container from the docker image
+endef
+export RUN_CONTAINER_HELP_INFO
+
+run-container:
+	@docker run -it $(IMAGE_NAME)
+
+# ============================================================================= #
+
+help:
+	@echo "Usage: make [TARGET] [VARIABLE=value]\n"
+	@echo "$$BUILD_IMAGE_HELP_INFO\n"
+	@echo "$$RUN_CONTAINER_HELP_INFO\n"

requirements.txt

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+Click
+python-dateutil
+pyfiglet