running vs2015 in docker image
Yes, this is possible. There is a Visual Studio blog post showing how to do this. While the instructions are for VS 2017, you should be able to substitute the VS 2015 command-line installer.
Note that there is a caveat in the blog page about VS 2015:
Installing Visual Studio 2013, 2015, or 2017 on microsoft/windowsservercore:10.0.14393.1593 (which may be your locally cached :latest depending on when you last pulled) fails. The bootstrapper fails to launch the installer. Please use either an older tagged build like :10.0.14393.1480 or newer tagged build like :10.0.14393.1715 – the current :latest when this post was first published.
Not yet! Docker depends on the sharing of an linux kernel.If you know to install VS2015 in Linux, you can install it in docker too.