Docker container won't start successful

After I followed the official steps documented at https://www.collaboraoffice.com/code/, the docker container is running but I cannot access localhost:9980.

⏻  ~  » docker pull collabora/code
Using default tag: latest
latest: Pulling from collabora/code
Digest: sha256:2f6d4ba03ec85bf3f123a0b477aa86052b03a53aad5214e32f47a3a7bd2e6423
Status: Image is up to date for collabora/code:latest

⏻  ~  » docker run -t -d -p 127.0.0.1:9980:9980 -e "domain=example\.com" \            
        -e "username=admin" -e "password=S3cRet" --restart always --cap-add MKNOD collabora/code
4dd70e61543f4c54063c2314cc3ae11365b65c18b0f741f3ab7379bc7597899a

docker logs 4dd show this:

Generating RSA private key, 2048 bit long modulus
..........................................................+++
............................................................................+++
e is 65537 (0x10001)
Generating RSA private key, 2048 bit long modulus
.......................................+++
..................+++
e is 65537 (0x10001)
Signature ok
subject=/C=DE/ST=BW/L=Stuttgart/O=Dummy Authority/CN=localhost
Getting CA Private Key
loolforkit version details: 3.3.1 - 0adc773
Init vcl
preload: merged unordf ucpchelp1 msforms vbaobj pcr vbaswobj sw animcore hwp flash chartcore solver sc wpftcalc xof ucpcmis1 wpftdraw sd svgfilter evtatt ucpftp1 graphicfilter wpftimpress placeware sdfilt sm pdffilter PresentationMinimizer rptxml protocolhandler ucpdav1 wpftwriter msword lwpft writerfilter t602filter xmlfa basctl binaryurp uuresolver scd chartcontroller ldapbe2 dba sdbt dbu dbmm deploymentgui migrationoo2 migrationoo3 xsltfilter sdd embobj emboleobj log expwrap odfflatxml textfd storagefd xmlfd frm fwl fwm io textconversiondlgs smd mozbootstrap oox scfilt OGLTrans slideshow proxyfac cairocanvas vclcanvas canvasfactory mtfrenderer simplecanvas oglcanvas rptui rpt res dlgprov basprov stringresource dbaxml mork odbc sdbc2 calc dbase flat writer xsec_xmlsec reflection bootstrap introspection invocation invocadapt namingservice stocservices cmdmail syssh cached1 ucphier1 ucpimage ucppkg1 srtrs1 ucptdoc1 xsltdlg swd cui bib guesslang offacc scn scriptframe dbpool2 xmlsecurity analysis date pricing fps_office i18nsearch wizards.agenda.CallWizard wizards.fax.CallWizard wizards.letter.CallWizard wizards.web.CallWizard xsec_fw vbaevents PresenterScreen pdfimport abp dbp mysql  ucpext hyphen spell lnth mailmerge for ctl passwordcontainer svgio updatefeed 
Preloading dictionaries: Whitelisted languages: de_DE en_GB en_US es_ES fr_FR it nl pt_BR pt_PT ru 
de_DE en_US fr_FR it_IT nl_NL pt_BR ru_RU en_GB nl_BE pt_PT es_ES 
Preloading thesauri: de_DE en_US fr_FR it_IT nl_NL pt_BR ru_RU en_GB nl_BE pt_PT es_ES 
Preload icons
Preload languages
kit-00037-00031 2018-08-08 07:05:43.549711 [ loolkit ] WRN  Linking/copying files from /opt/collaboraoffice5.3 to /opt/lool/child-roots/OZHXqOOGtZ8CtPU2/lo/ is taking too much time. Enabling verbose link/copy logging at information level.| kit/Kit.cpp:163
office version details: { "ProductName": "Collabora Office", "ProductVersion": "5.3", "ProductExtension": ".10.53", "BuildId": "cf2ac11617bce9c49c92d8153ef12b55e5b903f3" }
kit-00037-00031 2018-08-08 07:06:51.929116 [ loolkit ] WRN  Waking up dead poll thread [kit], started: false, finished: false| ./net/Socket.hpp:550
wsd-00029-00030 2018-08-08 07:06:51.929143 [ prisoner_poll ] WRN  ForKit not responsive for 86804 ms forking 1 children. Resetting.| wsd/LOOLWSD.cpp:385
kit-00043-00031 2018-08-08 07:06:52.494828 [ loolkit ] WRN  Waking up dead poll thread [kit], started: false, finished: false| ./net/Socket.hpp:550
wsd-00029-00041 2018-08-08 07:07:10.026660 [ websrv_poll ] ERR  Socket #21 SSL BIO error: error:1407609C:SSL routines:SSL23_GET_CLIENT_HELLO:http request (errno: Success)| ./net/SslSocket.hpp:281
wsd-00029-00041 2018-08-08 07:07:10.026961 [ websrv_poll ] ERR  Error while handling poll for socket #21 in websrv_poll: error:1407609C:SSL routines:SSL23_GET_CLIENT_HELLO:http request| ./net/Socket.hpp:517
…

while the last 2 lines keep repeating.

⏻  ~  » nc -v 127.0.0.1 9980  
Connection to 127.0.0.1 9980 port [tcp/*] succeeded!

⏻  ~  » curl -kL https://127.0.0.1:9980
OK

When I browse to https://127.0.0.1:9980 I also just get the OK and nothing else.

CollaboraOnline / Docker-CODE

Docker container won't start successful #39