Snapcraft is missing git as a build dependency

go projects need git and similar tools to fetch dependencies - https://github.com/golang/go/wiki/GoGetTools - and snapcraft doesn’t install them, which leads to the build error.

...
Please consider setting `go-importpath` for the 'podman' part                  
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/containers/libpod/pkg/chrootuser: exec: "git": executable file not found in $PATH
package github.com/containers/libpod/pkg/secrets: cannot find package "github.com/containers/libpod/pkg/secrets" in any of:
...

https://github.com/abitrolly/podman/blob/661e0fe45159cee1cfaa74aa9e186188edfc5437/snap/snapcraft.yaml#L16

Possible relavant source: https://github.com/snapcore/snapcraft/blob/master/snapcraft/plugins/go.py