add bash to exec if available. If not, fallback to sh

[a-peri]

This commit improves the "Exec" action for containers in src/docker.js:167.

Before: The exec command always used sh as the shell inside the container.

After: It first tries bash, and only falls back to sh if bash isn't available.

Summary by Sourcery

Update container exec action to prefer running an interactive bash shell and fall back to sh when bash is unavailable.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the container exec command to prefer bash when available, falling back to sh, while preserving the existing spawn behavior.

File-Level Changes

Change	Details	Files
Change the docker exec shell from always using sh to preferring bash with a fallback to sh.	Update the exec command string to first attempt docker exec -it <container> bash Add a logical OR fallback to run docker exec -it <container> sh if bash is not available Keep the trailing ; exec $SHELL so the host shell remains open after the docker exec command	src/docker.js

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[sourcery-ai]

Hey - I've left some high level feedback:

• The nested quoting ('docker exec ... bash || docker exec ... sh; exec $SHELL') is getting hard to read and reason about; consider switching to a template literal and/or sh -c inside the container to make the fallback logic and quoting clearer.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The nested quoting (`'docker exec ... bash || docker exec ... sh; exec $SHELL'`) is getting hard to read and reason about; consider switching to a template literal and/or `sh -c` inside the container to make the fallback logic and quoting clearer.

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