cmd/rofl/build: Pull builder Docker image at start and show progress

[abukosek]

Closes #589 and closes #590.

If artifacts.builder is set in rofl.yaml, the given Docker image is now pulled at the start of the rofl build process and the progress of the Docker layer pulling is also shown in real-time, so the user knows what is going on.

Example output with artifacts.builder set to ghcr.io/oasisprotocol/rofl-dev:main-minimal:

Deployment: test
Network:    testnet
ParaTime:   sapphire
Debug:      false
App ID:     rofl1qp55evqls4qg6cjw5fnlv4al9ptc0fsakvxvd9uw
Name:       demo-rofl
Version:    0.2.0
TEE:        tdx
Kind:       container

Initializing build environment...
Unable to find image 'ghcr.io/oasisprotocol/rofl-dev:main-minimal' locally
main-minimal: Pulling from oasisprotocol/rofl-dev
1adabd6b0d6b: Pull complete 
98807ed13a7f: Pull complete 
e9511b254cfc: Pull complete 
Digest: sha256:2a93fa747fa5e2735d6fbdbbd1179dc077ebfcbb14df2694513c1cce96cb06c2
Status: Downloaded newer image for ghcr.io/oasisprotocol/rofl-dev:main-minimal
Building a container-based TDX ROFL application...
[...]

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[matevz]

Works as expected, thanks.