Adds 'ci' justfile target. #1055

Job	Run time
positron / docker	1m 15s
agent / agent	1m 55s
jupyterlab / native (macos-latest)	3m 25s
build / build	3m 34s
jupyterlab / native (windows-latest)	7m 28s
positron / native (macos-latest)	56s
jupyterlab / native (ubuntu-latest)	2m 59s
web / web	1m 9s
positron / native (windows-latest)	1m 25s
positron / native (ubuntu-latest)	2m 11s
bats / native (macos-latest)	19s
bats / docker (ubuntu-latest)	1m 50s
cypress / native (macos-latest)	1m 0s
bats / native (windows-latest)	1m 8s
cypress / native (windows-latest)	4m 10s
bats / native (ubuntu-latest)	17s
cypress / native (ubuntu-latest)	44s
	35m 45s

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