Update GitHub Actions workflows

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Update default OS and plan for Hetzner and DigitalOcean

Update the default OS image for Hetzner from ubuntu-22.04 to debian-13.
Update the default OS image for DigitalOcean from ubuntu-22-04-x64 to
debian-13-x64 and the plan from s-1vcpu-1gb to s-1vcpu-512mb-10gb.

Signed-off-by: Han Verstraete (OpenFaaS Ltd) <han@openfaas.com>

Create and own userdata within inletsctl

HTTPS userdata was already owned inside inletsctl, but not for
TCP tunnels. This has now been pulled up from cloudprovision
for easier maintenance.

Unit tests updated and pass. Converted from string concat to
string interpolation with fmt.Sprintf.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Bump Hetzner to use cx23 instance

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Reduce RAM for builds

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Use latest inlets-pro version

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Update AWS AMI to use newer image

The older one had been retracted/deleted. This image was
built in 2025.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Use version 0.10.2 of inlets-pro

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Improve docs for base command

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Update default inlets version to 0.9.40

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>