Error when building: cannot open '/app/.meteor/local/shell/info.json' for reading: Permission denied

[dalareo]

Sending build context to Docker daemon  68.83MB
Step 1/1 : FROM aedm/minimeteor
# Executing 9 build triggers
 ---> Using cache
Removing intermediate container 67d13b0627dc
 ---> Running in ee1e4df1bf63
Removing intermediate container ee1e4df1bf63
 ---> Running in abef8990f6d2

# Install build tools
echo [minimeteor] Installing build tools
+ echo [minimeteor] Installing build tools
apt-get -qq update
+ apt-get -qq update
Current option settings
errexit         on
noglob          off
ignoreeof       off
interactive     off
monitor         off
noexec          off
stdin           off
xtrace          on
verbose         off
vi              off
emacs           off
noclobber       off
allexport       off
notify          off
nounset         off
nolog           off
debug           off
[minimeteor] Installing build tools
apt-get -y install curl procps python g++ make sudo git bzip2 libc6 >/dev/null
+ apt-get -y install curl procps python g++ make sudo git bzip2 libc6
debconf: delaying package configuration, since apt-utils is not installed

# Create non-root user
useradd -m user
+ useradd -m user
sudo -u user cp -r /app /home/user/
+ sudo -u user cp -r /app /home/user/
cp: cannot open '/app/.meteor/local/shell/info.json' for reading: Permission denied
The command '/bin/sh -c /minimeteor/onbuild.sh' returned a non-zero code: 1