Add Environment Variable for Progress Mode

[nrthakur]

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Motivation and Context

Environment Variable for Progress Mode

Adds support for a CONTAINER_CLI_PROGRESS environment variable that allows users to set their preferred default progress mode (none, ansi, plain) without passing --progress
on every command.

This follows the same pattern as BUILDKIT_PROGRESS and aligns with the project's transition from macOS user defaults to environment variables for configuration.

Precedence: --progress flag → CONTAINER_CLI_PROGRESS env var → default (ansi)

Affected commands: container image pull, container image push, container run

Note: color mode support is commented out, pending merge of #1384. Once merged, uncommenting case color in the enum and updating the help text is all that's needed.

Closes #1406

Testing

• Tested locally
• Added/updated tests
• Added/updated docs

Test Instructions

# Default (ansi) — no flag, no env var
container image pull alpine

# Env var sets mode
CONTAINER_CLI_PROGRESS=plain container image pull alpine

# Flag overrides env var
CONTAINER_CLI_PROGRESS=plain container --progress ansi image pull alpine

# Env var disables progress
CONTAINER_CLI_PROGRESS=none container image pull alpine

# Invalid env var falls back to default (ansi)
CONTAINER_CLI_PROGRESS=bogus container image pull alpine

[jglogan]

@nrthakur You'll likely have a few more conflicts to fix since the plan is to merge #1392 next.

[nrthakur]

@nrthakur You'll likely have a few more conflicts to fix since the plan is to merge #1392 next.

@jglogan game over

jk 😛 fixing these for now fixed; will address conflicts introduced by #1392

Thanks for the heads up!

[jglogan]

@nrthakur Did you resolve the conflicts? I currently see two files.

[nrthakur]

@nrthakur Did you resolve the conflicts? I currently see two files.

@jglogan Oops, should've been more clear, I had fixed the conflicts introduced by merging my colour PR this morning. Just addressed the conflicts introduced by #1392

This PR should be in a reviewable state now. Thanks!