The short version is: a steady job is always a positive point in your CV compared to not having a steady job. But it does not matter for software development, which non-software-development job it is. IT Helpdesk is as much software development as retail or working the fryer at a fast food chain. All respectable jobs, one has to make money somehow, but they have nothing to do with software development.
If you want to get into software development, there is three things helping: experience in software development, a prior job in software development and a solid education in software development. Anything else on your CV I wont hold against you, but it won't help.
Software Development is not a step on a ladder you climb, with helpdesk below and manager above. It is a ladder on it's own. Anything else than software development, even in the same company, doesn't help you to get onto that ladder.
What would really help you get a job in my area of the world, is an education. Software development is not this new, unknown beast anymore where people employ anybody who can spell computer. That was 20-25 years ago. Yes, there are self-taught people, but they are old. Like my age. Back then there were no options for education in CS in a 100 mile radius and I'm living in the capital of a federal state. And today, those people all have decades of experience to trump any education somebody else might bring. But starting now, there is all kinds of CS programs. Every university or college has one, apprenticeships have different specialisations depending on which part of software development you are most interested in, there is courses and even college degrees to be had remotely after normal working hours.
So if you can get a job in software development now, that is great. Go get it. If you cannot because employers want to see more qualifications, a github reposity is good... but an education is better. Way better. So if you can, take the job that pays the bills for the least amount of effort and see if you can get an education any way possible in your region.