[releng] Issue #7763: define and implement retention policy for nightly composes

[Mohan Boddu]

mohanboddu added a new comment to an issue you are following:
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From RelEng meeting on May 29 2019:

```
#info We will not change the policy but we will keep track of the koji event id (probably in fpdc) from which we can clone a koji tag and run a compose from it if and when its really needed.
```
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https://pagure.io/releng/issue/7763