ci(release): add dispatch GHA for snapcraft classic release

[qweeah]

What this PR does / why we need it:
This PR adds a Github Action which can be run manually to for snapcraft releasing.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1079

Please check the following list:

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.07%. Comparing base (2d0431d) to head (b4e12c0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1256   +/-   ##
=======================================
  Coverage   85.07%   85.07%           
=======================================
  Files         107      107           
  Lines        3806     3806           
=======================================
  Hits         3238     3238           
  Misses        339      339           
  Partials      229      229           

☔ View full report in Codecov by Sentry.
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[qweeah]

Making this PR draft since the login credential has not been added to repo secrets. (see instruction)

[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[SamirPS]

@qweeah Do you need help for this PR ?

[qweeah]

@qweeah Do you need help for this PR ?

Thanks @SamirPS, currently I don't need any help. I have walked through the build and publish part on Snapcraft side, just need to tune the release process to fit ORAS' release practice.

[qweeah]

After this being merged, we still need to run below command to add the content of exported.txt to oras's Actions secret named STORE_LOGIN

snapcraft export-login --snaps=oras \
      --acls package_access,package_push,package_update,package_release \
      exported.txt

[shizhMSFT]

LGTM