[ci] use Alpine Linux VMs to test additional arch #5
pr.yml
on: push
Linux-ubuntu-gcc
24s
Linux-ubuntu-clang
36s
macOS
58s
DragonflyBSD
2m 57s
FreeBSD
4m 17s
NetBSD
2m 33s
OpenBSD
3m 17s
Linux-alpine-x86_64
2m 18s
Matrix: Linux-alpine
Matrix: Windows-MSYS2
Matrix: Windows-VisualStudio