refactor: remove old Gitpod configuration #39

	name: development container tests

	on:
	push:
	branches:
	- '*'

	jobs:
	devcontainer:
	runs-on: ubuntu-22.04

	steps:

	- name: Check out source repository
	uses: actions/checkout@v3

	- name: Build Docker image
	run: docker build -t moranpycess:latest -f Dockerfile .

	# non-interactive shell needs to initialise & activate conda in a different way than -it
	# ~AngryMaciek
	- name: make help
	run: \|
	docker run --name moranpycess -v /home/runner/work/angry-moran-simulator/angry-moran-simulator:/moranpycess moranpycess /bin/bash -c "source /mambaforge/etc/profile.d/conda.sh && conda activate moranpycess-dev && make"
	docker rm moranpycess
	# Dockerception is not advised (running Docker in a Docker, dind)
	# https://stackoverflow.com/a/33003273/2340598
	#
	# While running the ci (github actions) we already start a container
	# for each workflow; then above we build another container and would
	# execute commands inside it. This is not a good practice.
	# In the CI issues arise related to file permissions on the mounted
	# volume (the moranpycess source code). Therefore we will only test
	# "make help", not all commands of the Makefile.
	# Development from the container has been tested locally and the
	# commands are functional.
	# By the way: I don't expect many developers would insist on contributing
	# from a container anyway...
	# ~AngryMaciek

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