Certainly scripted languages run fine on ARM Linux, however there are some caveats worth mentioning. ARM JIT compilers for some platforms and languages may be not as mature or performant as their x86 counterparts since they haven't been battletested as much in the server landscape. Also, if you are using C extensions that don't compile to ARM, obviously that is going to affect you. And finally, if any part of your CI is building images containing native code (even if all of your code is say, Python,) you are going to need to duplicate that process for ARM, possibly requiring some retooling of your build system.
I am very curious to see how it plays out. I've been waiting for a cloud ARM offering from a major provider for a while now (there have been some smaller but notable players like Scaleway, but demand seemed to always outrun supply, and I couldn't get VMs running near me in America.)
I use an ARM laptop for travel. I've had a lot of problems with running Python code. Mostly data-science related. A lot of recompilation is required, which is a hassle. Also, sometimes you'll be constrained in what libraries you can use, because some of them simply don't work on ARM, due to ARM specific bugs. NUMBA is one that caused a lot of headache, but I think they got it fixed since.
Asus C201P. ~180 euros. Very durable, battery lasts for 10 hours easy, more if only programming. It's preinstalled with ChromeOS. Installing Linux took some tinkering; there are some blog posts around that were very helpful.
I am very curious to see how it plays out. I've been waiting for a cloud ARM offering from a major provider for a while now (there have been some smaller but notable players like Scaleway, but demand seemed to always outrun supply, and I couldn't get VMs running near me in America.)