ci: handle sudo in actions-install.sh

ci: handle sudo in actions-install.sh

We run our tests as root in containers and VMs. Those platforms do not
have sudo. Use a small bash function to eliminate the need to install
sudo at the very beginning of the dependency installation script.

This function just checks for the existence of sudo and uses it when
installed but does nothing when it is not installed. With this function
we can just add sudo to the list of packages to install like all the
other packages. We may still need sudo in one of our test scripts.

Signed-off-by: Vincent Fu <vincent.fu@samsung.com>