Add seed script for challenge slug

[krtkvrm]

This PR adds seed script for challenge slug

[codecov-io]

Codecov Report

Merging #2533 into master will decrease coverage by 0.17%.
The diff coverage is 51.12%.

@@            Coverage Diff             @@
##           master    #2533      +/-   ##
==========================================
- Coverage   72.93%   72.75%   -0.18%     
==========================================
  Files          83       84       +1     
  Lines        5368     5454      +86     
==========================================
+ Hits         3915     3968      +53     
- Misses       1453     1486      +33     

Impacted Files	Coverage Δ
apps/challenges/urls.py	100.00% <ø> (ø)
apps/challenges/views.py	100.00% <ø> (ø)
apps/jobs/urls.py	100.00% <ø> (ø)
frontend/src/js/controllers/challengeCtrl.js	73.78% <0.00%> (+0.08%)	⬆️
scripts/workers/rl_submission_worker.py	0.00% <0.00%> (ø)
scripts/workers/worker_utils.py	0.00% <0.00%> (ø)
apps/jobs/aws_utils.py	7.69% <7.69%> (ø)
apps/jobs/admin.py	77.41% <57.14%> (+5.62%)	⬆️
apps/jobs/utils.py	58.42% <60.71%> (+4.58%)	⬆️
apps/base/utils.py	63.79% <92.85%> (+6.51%)	⬆️
... and 11 more

Impacted Files	Coverage Δ
apps/challenges/urls.py	100.00% <ø> (ø)
apps/challenges/views.py	100.00% <ø> (ø)
apps/jobs/urls.py	100.00% <ø> (ø)
frontend/src/js/controllers/challengeCtrl.js	73.78% <0.00%> (+0.08%)	⬆️
scripts/workers/rl_submission_worker.py	0.00% <0.00%> (ø)
scripts/workers/worker_utils.py	0.00% <0.00%> (ø)
apps/jobs/aws_utils.py	7.69% <7.69%> (ø)
apps/jobs/admin.py	77.41% <57.14%> (+5.62%)	⬆️
apps/jobs/utils.py	58.42% <60.71%> (+4.58%)	⬆️
apps/base/utils.py	63.79% <92.85%> (+6.51%)	⬆️
... and 11 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f7bf329...8eee046. Read the comment docs.

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.