ci: add nightly build job

[zyy17]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Add GitHub nightly build. The GitHub Action will be scheduled at 00:00 everyday to build the develop branch and release artifacts for using tag 0.1.0-alpha-<YYYYMMDD>-nightly.

Please explain IN DETAIL what the changes are in this PR and why they are needed:

• Summarize your change (mandatory)
  Modify the release.yaml:

  • Add GitHub Action cron;
  • Using the different formats of the tag for different trigger event('scheduled' or normal release);

• How does this PR work? Need a brief introduction for the changed logic (optional)

• Describe clearly one logical change and avoid lazy messages (optional)

• Describe any limitations of the current code (optional)

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Merging #565 (7d4ca55) into develop (f878827) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #565      +/-   ##
===========================================
+ Coverage    86.35%   86.37%   +0.01%     
===========================================
  Files          398      398              
  Lines        50165    50165              
===========================================
+ Hits         43322    43328       +6     
+ Misses        6843     6837       -6     

Flag	Coverage Δ
rust	86.37% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/storage/src/region/tests.rs	95.63% <0.00%> (-0.49%)	⬇️
src/servers/src/opentsdb.rs	98.41% <0.00%> (+1.58%)	⬆️
src/servers/src/error.rs	43.24% <0.00%> (+16.21%)	⬆️

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[evenyag]

LGTM

[waynexia]

I heard github action's crontab has a very heavy delay, let's see how it goes here 🤣

[zyy17]

@waynexia I test in my private repo and the result looks acceptable. We don't need the precise schedule.