OSX: ssh docker setup is not working for maint and master

see e.g. https://github.com/datalad/git-annex/actions/runs/458535490 runs
```
2021-01-03T02:45:26.5758460Z 57a3a5a52691: Pull complete
2021-01-03T02:45:26.5818610Z Digest: sha256:f5e151dc378ce081e3009e0780d96ba96bd003be07f7da8be626ecce5511e0f1
2021-01-03T02:45:26.5837070Z Status: Downloaded newer image for dataladtester/docker-ssh-target:latest
2021-01-03T02:45:26.5843510Z ---> eff5a230c1b6
2021-01-03T02:45:26.5848370Z Step 2/4 : RUN groupadd -og 20 dl && useradd -ms /bin/bash -ou 501 -g dl dl && mkdir -p /home/dl/.ssh && chown -R dl:dl /home/dl/ && echo 'dl:dl' | chpasswd
2021-01-03T02:45:26.7088880Z ---> Running in c227b4f3181b
2021-01-03T02:45:27.1036730Z Removing intermediate container c227b4f3181b
2021-01-03T02:45:27.1042410Z ---> 8c8f201d0430
2021-01-03T02:45:27.1046170Z Step 3/4 : CMD ["/usr/sbin/sshd", "-D"]
2021-01-03T02:45:27.1292980Z ---> Running in dd6112c08e62
2021-01-03T02:45:27.1851620Z Removing intermediate container dd6112c08e62
2021-01-03T02:45:27.1855330Z ---> 47602e520b19
2021-01-03T02:45:27.1856340Z Step 4/4 : RUN mkdir -p "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T"
2021-01-03T02:45:27.2110890Z ---> Running in 5c1475e5bade
2021-01-03T02:45:27.4972770Z Removing intermediate container 5c1475e5bade
2021-01-03T02:45:27.4976210Z ---> ea7b055ec3e6
2021-01-03T02:45:27.4983950Z Successfully built ea7b055ec3e6
2021-01-03T02:45:27.5029840Z Successfully tagged datalad-tests-ssh:latest
2021-01-03T02:45:27.5756460Z ac072058773fb66ab0dec91d80af3fba86b5293374d92a49169f3de39fdec683
2021-01-03T02:45:27.9241170Z cfe67f0b48989a2f2d007dbf66614dd6ca7c1590be5c48bfb172bb767cd90f3c
2021-01-03T02:45:28.2400480Z nc: connectx to localhost port 42241 (tcp) failed: Connection refused
2021-01-03T02:45:28.2402450Z nc: connectx to localhost port 42241 (tcp) failed: Connection refused
2021-01-03T02:45:29.4298790Z nc: connectx to localhost port 42241 (tcp) failed: Connection refused
2021-01-03T02:45:29.4300300Z nc: connectx to localhost port 42241 (tcp) failed: Connection refused
.... the same is filling up the logs ....
```

did not look inside on how to resolve but must be possible one way or another (may be it is just a port conflict issue among multiple docker instances on the same box?)