Fix docker build issues

[sidevesh]

No description provided.

[sidevesh]

Came across this repo when trying to modify an app, thanks for keeping this running!
This PR should fix some issues I faced getting this running.

[juhnhooo]

Good morning,
I'm very interested in getting CloudPebble up and running locally but there's no way. I have tried it with toolbox for mac and toolbox for windows and I run into the same error. When I run ./dev_setup.sh at the end I get a gpg error attached screenshot. Can you help me?

Running in 8c6ad411700f

• gpg --keyserver ha.pool.sks-keyservers.net --recv-keys 9554F04D7259F04124DE6B476D5A82AC7E37093B
  gpg: WARNING: unsafe permissions on homedir '/root/.gnupg'
  gpg: keybox '/root/.gnupg/pubring.kbx' created
  gpg: keyserver receive failed: Server indicated a failure
  ERROR: Service 'ycmd' failed to build: The command '/bin/sh -c set -ex && for key in 9554F04D7259F04124DE6B476D5A82AC7E37093B 94AE36675C464D64BAFA68DD7434390BDBE9B9C5 0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 FD3A5288F042B6850C66B31F09FE44734EB7990E 71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 DD8F2338BAE7501E3DD5AC78C273792F7D83545D C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 B9AE9905FFD7803F25714661B63B535A4C206CA9 ; do gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; done' returned a non-zero code: 2

How can I solve this so that it works.

Many thanks for everything.