How to change the default /bin/sh to /bin/bash on opening CLI for selected container in Docker Desktop?

Not exactly answer you asked for but for me it works to type bash in sh terminal. It opens bash over the sh. Only nousance is that I must exit twice.

It will depend on the base image, you can build a custom image and add bash if it is not available. And link the create a link to use bash instead of sh

FROM <BASE_IMAGE>
RUN apk add --no-cache bash

RUN ln -sf /bin/bash /bin/sh

I changed default shell into bash by making a new image with below Dockerfile commands.

# Dockerfile
FROM <parent image>

# make /bin/sh symlink to bash instead of dash:
RUN echo "dash dash/sh boolean false" | debconf-set-selections
RUN DEBIAN_FRONTEND=noninteractive dpkg-reconfigure dash

# set ENV to execute startup scripts
ENV ENV ~/.profile

and create a new image.

$ docker build --tag <image> .

1. change symbolic link of /bin/sh to bash

   https://superuser.com/questions/715722/how-to-do-dpkg-reconfigure-dash-as-bash-automatically

2. source ~/.profile file when executing /bin/sh

   Is there an alternative for .bashrc for /bin/sh?

3. If you want to clear ENV after startup, you may add below line to the ~/.bashrc file. (Be careful not to mess up other scripts)

   unset ENV