@pluk I can understand that - I don’t do shifts but still struggle to fit things in around work and my daughter.
Could you perhaps try to set a target of number of runs per week (rather than specific days) and see if you can hit that? I always aim for 3 per week and one long run a fortnight - don’t always manage it but at least I’m aiming for something.
I know someone who does 2 x 5k on a running day rather than 1 x 10 as that’s how she can fit it in. I don’t think I could drag myself out twice in one day but it works for her and means she’s not away from her desk for a long stretch of time.