Livepush fails at npm install... stage if package.json is modified.

[srlowe]

If package.json is modified, then livepush fails during rm -rf /tmp/* (after npm install etc.) with Device or resource busy errors.

[Live]    Detected changes for container main, updating...
[Live]    [main] Executing command: `npm install --ci --production     && npm cache clean --force     && rm -rf /tmp/*`
[Live]    [main]    up to date in 1.056s
[Live]    [main]    found 0 vulnerabilities
[Live]    [main]    npm
[Live]    [main]     
[Live]    [main]    WARN 
[Live]    [main]    using --force
[Live]    [main]     I sure hope you know what you are doing.
[Live]    [main]    rm: cannot remove '/tmp/balena': Device or resource busy
[Live]    [main]    rm: cannot remove '/tmp/resin': Device or resource busy
[Error]   [main]   Command npm install --ci --production     && npm cache clean --force     && rm -rf /tmp/* failed with exit code: 1

Confirmed on both Linux and Windows.