silverback build needs some UX feedback that it's doing something

[fubuloubu]

Probably have it print out the steps it is doing through subprocessing

[linear]

SBK-575 `silverback build` needs some UX feedback that it's doing something

[fubuloubu]

Took about 3 minutes to display this:

$ silverback build
Error during docker build:
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

The command '/bin/sh -c ape plugins install .' returned a non-zero code: 1

Traceback (most recent call last):
  File ".local/bin/silverback", line 8, in <module>
    sys.exit(cli())
             ^^^^^
  File "site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "site-packages/silverback/_cli.py", line 179, in build
    result = subprocess.run(
             ^^^^^^^^^^^^^^^
  File "cpython-3.12.6-linux-x86_64-gnu/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['docker', 'build', '-f', './.silverback-images/Dockerfile.compliance', '-t', 'compliance:latest', '.']' returned non-zero exit status 1.