Fix documentserver update failure due to unexposed port 8000

[EnDjeee]

Problem:
The wait-for-it.sh script (used in run-community-server.sh) runs indefinitely because the documentserver container does not expose port 8000. This blocks updates triggered from the control panel, as the script waits for a port that is never opened.

Solution:
Expose port 8000 in the documentserver container by modifying its creation command in install.sh.

Details:

• The wait-for-it.sh script checks for port 8000 to confirm the documentserver is ready.
• If the port is not exposed, the script hangs indefinitely, preventing updates.
• Exposing port 8000 ensures the script can detect the container’s readiness and proceed with updates.
• Port 8000 should be exposed as stated here: https://helpcenter.onlyoffice.com/docs/installation/docs-community-open-ports.aspx

[CLAassistant]

All committers have signed the CLA.

[EnDjeee]

Apologies, @roberttilewick. I had to close the previous pull request due to an issue with signing the original commit.

Regarding your question, exposing the port 8000 on the document server resolved the issue for me