RFR: 58: Add mirror and forward bots to skara-bots CLI image

[Erik Duveblad via github.com]

HI all,

when I added the `mirror` and `forward` bots I forgot to add them to the bots CLI image (sigh). This is now fixed in this patch.

# Testing
- [x] Ensured `mirror` and `forward` bots are present in `skara-bots --list-bots` output

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Commits:
 - 21e88598:	58: Add mirror and forward bots to skara-bots CLI image

Pull request:
https://git.openjdk.java.net/skara/pull/45

Webrev:
https://webrevs.openjdk.java.net/skara/45/webrev.00

Patch:
https://git.openjdk.java.net/skara/pull/45.diff

Fetch command:
git fetch https://git.openjdk.java.net/skara pull/45/head:pull/45