Piggy bank example won't run on Windows

[dg-concordium]

Bug Description

When I try to follow the instructions to install and run the piggy bank example, I get an error when I run yarn build:all.

Steps to Reproduce
Open the repo.
Navigate to the piggy bank example.
Run yarn. Result is OK if I ignore checksum.
Run yarn build:all and get error:

PS C:\concordium-browser-wallet\examples\piggybank> yarn build:all
➤ [wccd]: Process started
➤ [wccd]: (node:15116) ExperimentalWarning: Custom ESM Loaders is an experimental feature. This feature could change at any time
➤ [wccd]: (Use node --trace-warnings ... to show where the warning was created)
➤ [wccd]:
➤ [wccd]: dist\index.js 4.5mb
➤ [wccd]: dist\index.css 3.2kb
➤ [wccd]:
➤ [wccd]: Done in 317ms
➤ [wccd]:
➤ [wccd]: dist/index.html - 524
➤ [wccd]: HTML Plugin Done in 88ms
➤ [wccd]: 'cp' is not recognized as an internal or external command,
➤ [wccd]: operable program or batch file.
➤ [wccd]: command not found: cp
➤ [wccd]: Process exited (exit code 127), completed in 2s 976ms
➤ The command failed for workspaces that are depended upon by other workspaces; can't satisfy the dependency graph
➤ Failed with errors in 2s 983ms

Expected Result

Should be able to run the example on all platforms.

Actual Result
cp command is unknown in Windows.

Søren B. Zeppelin knows about this issue.