chore: add dockerhub publish & adjust data directory

[ZuLiangWang]

Which issue does this PR close?

Closes #

Rationale for this change

Publish CeresMeta image to dockerhub.

What changes are included in this PR?

• Add dockerhub-publish.yml
• Add Dockerfile
• Adjust the directory where files are stored so that all files are placed in the same folder.

Are there any user-facing changes?

None.

How does this change test

Successfully build the image in the local environment.

[codecov-commenter]

Codecov Report

Merging #137 (59e1f7d) into main (494e15e) will decrease coverage by 0.09%. The diff coverage is 39.08%.

:exclamation: Current head 59e1f7d differs from pull request most recent head ca33f72. Consider uploading reports for the commit ca33f72 to get more accurate results

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
- Coverage   39.07%   38.99%   -0.09%     
==========================================
  Files          33       33              
  Lines        4217     4234      +17     
==========================================
+ Hits         1648     1651       +3     
- Misses       2317     2331      +14     
  Partials      252      252              

Impacted Files	Coverage Δ
server/cluster/cluster.go	0.00% <0.00%> (ø)
server/cluster/table_manager.go	0.00% <0.00%> (ø)
server/cluster/types.go	0.00% <0.00%> (ø)
...er/coordinator/procedure/create_partition_table.go	39.11% <9.67%> (-1.40%)	:arrow_down:
server/coordinator/procedure/create_table.go	46.23% <50.00%> (ø)
server/storage/types.go	70.10% <86.66%> (-0.45%)	:arrow_down:
.../coordinator/procedure/create_table_common_util.go	70.49% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[chunshao90]

Update What changes are included in this PR?.