Update the stale workflow and docker image build file

[WenjieDu]

What does this PR do?

1. auto close completed issues as completed;
2. update the docker image build file;

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coveralls]

Coverage Report for CI Build 27093443121

Coverage decreased (-0.005%) to 81.523%

Details

• Coverage decreased (-0.005%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 3 coverage regressions across 3 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

3 previously-covered lines in 3 files lost coverage.

File	Lines Losing Coverage	Coverage
pypots/cli/base.py	1	93.94%
pypots/nn/modules/moment/backbone.py	1	13.42%
pypots/nn/modules/ts2vec/backbone.py	1	59.86%

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Coverage Stats

Relevant Lines:	20745
Covered Lines:	16912
Line Coverage:	81.52%
Coverage Strength:	1.63 hits per line

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💛 - Coveralls