Sometimes, but not always, the holos show buildplans command produces no
output.
```
❯ holos show buildplans --selector app.holos.run/cluster==w3 --log-level=debug
finalized config from flags
rendered platform in 13.458µs
```
It only happens when there's a selector. It doesn't happen without the
selector flag. It only happens with ==, not with =.
This test fails quickly.
```
while [[ $(holos show buildplans --selector app.holos.run/cluster==w3 --log-level=debug | wc -l) -eq 39 ]]; do true; done
```
This test runs until killed.
```
while [[ $(holos show buildplans --log-level=debug | wc -l) -eq 279 ]]; do true; done
```
Solution:
The problem is the use of the map. Iterating over the keys happens in a
random order. With the fix we check in an explicit order.
