feat: use docker volumes & nxrm pro to use PostgreSQL

[madpah]

This PR initially set out to resolve #37 - however in order to achieve this, #16 was also required to be included.

This is due to the nature of how the Sonatype Nexus Repository Container Images use the /nexus-data directory.

[hboutemy]

Tested on Linux, with a license copied to config/sonatype-license-all.lic:

• proxied profile works (just has warning on postgres-nxrm_1 FATAL: sorry, too many clients already)
• direct profile is not ok, issue accessing the same license file through volume:

ERROR: for sonatype-platform-reference_nxiq-direct_1  Cannot start service nxiq-direct: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: error mounting "/home/herve/tmp/sonatype-platform-reference/config/sonatype-license-all.lic" to rootfs at "/sonatype-license.lic": mount /home/herve/tmp/sonatype-platform-reference/config/sonatype-license-all.lic:/sonatype-license.lic (via /proc/self/fd/6), flags: 0x500
Starting sonatype-platform-reference_nxrm3-direct_1  ... error

[madpah]

Can you confirm whether volumes were cleanup up / removed (docker volume prune --all) between testing the different profiles @hboutemy ?

[hboutemy]

ok, after docker volume prune --all, direct works exactly as proxied

I need to test also on Mac...

[hboutemy]

on Mac, direct profile works but not proxied:

 ✔ Container sonatype-platform-reference-postgres-1                   Created                                                                                                                                                                                         0.0s
 ✔ Container sonatype-platform-reference-postgres-nxrm-1              Created                                                                                                                                                                                         0.0s
 ✔ Container sonatype-platform-reference-proxy-1                      Stopped                                                                                                                                                                                         0.0s
 ✔ Container 9a1a53017ec7_sonatype-platform-reference-nxiq-proxied-1  Removed                                                                                                                                                                                         0.0s
 ⠋ Container sonatype-platform-reference-nxiq-proxied-1               Recreate                                                                                                                                                                                        0.0s
 ⠋ Container sonatype-platform-reference-nxrm3-proxied-1              Recreate                                                                                                                                                                                        0.0s
Error response from daemon: invalid mount config for type "bind": bind source path does not exist: /Users/hboutemy/dev/git/sonatype-nexus-community/sonatype-platform-reference/data/nexus-data

I had to mkdir data/nexus-data and it's ok

[hboutemy]

great to see Linux working as smoothly as Mac now :)