Add verify checksum flag to the email when project release

[rv0lt]

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1. Always create a Draft PR first
2. Go through sections 1-5 below, fill them in and check all the boxes
3. Make sure that the branch is updated; if there's an "Update branch" button at the bottom of the PR, rebase or update branch.
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1. Description / Summary

Add the flag --verify-checksum to the command example in the email template

2. Jira task / GitHub issue

https://scilifelab.atlassian.net/jira/software/projects/DDS/boards/13?selectedIssue=DDS-1409

3. Type of change

What type of change(s) does the PR contain?

Check the relevant boxes below. For an explanation of the different sections, enter edit mode of this PR description template.

• New feature
  • Breaking: Why / How? Add info here.
  • Non-breaking
• Database change: Remember the to include a new migration version, or explain here why it's not needed.
• Bug fix
• Security Alert fix
• Documentation
• Workflow
• Tests only

4. Additional information

• Sprintlog
• Blocking PRs
  • Merged
• PR to master branch: _If checked, read the release instructions
  • I have followed steps 1-8.

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[codecov]

Codecov Report

Merging #1478 (2bdd4ce) into dev (b14b1cf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1478   +/-   ##
=======================================
  Coverage   90.19%   90.19%           
=======================================
  Files          29       29           
  Lines        4426     4426           
=======================================
  Hits         3992     3992           
  Misses        434      434           

[i-oden]

@rv0lt You can merge when the checks have passed -- up to you if you want to do that today or wait until Monday