Refactor GitHub workflows to use "ubuntu-latest" instead of "ubuntu-1… #64

	name: Singularity build
	on: [push, pull_request]
	jobs:

	build:
	name: Build
	runs-on: ubuntu-latest
	strategy:
	matrix:
	singularity_version:
	- '3.7.3'
	container:
	image: quay.io/singularity/singularity:v${{ matrix.singularity_version }}
	options: --privileged
	steps:
	- name: Check out code for the container build
	uses: actions/checkout@v1

	- name: Install useful utilities
	run: apk update && apk add --no-cache tree figlet wget

	- name: Build and test container
	run: \|
	for DIRECTORY in *
	do
	if [ -d $DIRECTORY ]; then
	if [[ $DIRECTORY != 'images' ]]; then
	cd $DIRECTORY

	if [ ! -f .ignore ]; then
	echo "Building container"
	bash ./build.sh

	if [ -f ./test.sh ]; then
	echo "Running tests"
	bash ./test.sh
	else
	echo "Test file not found. Skipping tests."
	fi
	fi
	cd ..
	fi
	fi
	done

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