$ docker --version
Docker version 27.3.0, build e85edf8

$ ls /home/coder/casts
new-cliui-select      new-prompt-multiple      new-prompt-rich-parameter  new-roles-edit       no-blink               original-create-workspace  original-prompt-multi-select    original-prompt-select  original-template-delete
new-create-workspace  new-prompt-multi-select  new-prompt-select          new-template-delete  original-cliui-select  original-prompt-multiple   original-prompt-rich-parameter  original-roles-edit

$ docker run --rm -it \
    -v /home/coder/casts/:/opt/casts:rw \
    -e ENVBUILDER_GIT_URL=https://github.com/coder/envbuilder-starter-devcontainer \
    -e ENVBUILDER_INIT_SCRIPT=bash \
    envbuilder:latest

devcontainer # ls /opt/casts/
new-cliui-select      new-prompt-multi-select  new-prompt-rich-parameter  new-roles-edit       no-blink               original-create-workspace     original-prompt-multiple        original-prompt-select  original-template-delete
new-create-workspace  new-prompt-multiple      new-prompt-select          new-template-delete  original-cliui-select  original-prompt-multi-select  original-prompt-rich-parameter  original-roles-edit

devcontainer # exit

$ ls /home/coder/casts
new-cliui-select      new-prompt-multiple      new-prompt-rich-parameter  new-roles-edit       no-blink               original-create-workspace  original-prompt-multi-select    original-prompt-select  original-template-delete
new-create-workspace  new-prompt-multi-select  new-prompt-select          new-template-delete  original-cliui-select  original-prompt-multiple   original-prompt-rich-parameter  original-roles-edit

$ docker --version
Docker version 27.3.1, build ce12230

$ ls /tmp/important
a  b  c

$ docker run --rm -it \
    -v /tmp/important:/opt/important:rw \
    -e ENVBUILDER_GIT_URL=https://github.com/coder/envbuilder-starter-devcontainer \
    -e ENVBUILDER_INIT_SCRIPT=bash \
    ghcr.io/coder/envbuilder:latest

devcontainer # ls /opt/important/
a  b  c

devcontainer # exit

$ ls /tmp/important
a  b  c