Google cloud build missing cache hit

### Expected behavior
I am using `cacheFrom:` and cloud build and I expected that the cache image is used when building
### Actual behavior
The image often is not found and so t is going to rebuild again from scratch also if not going to change the commit at all.
### Information
`skaffold dev`
After I close skaffold the image is rebuilt again and I run again `skaffold dev`
I am using
```
tagPolicy:
gitCommit: {}
```
And I suppose it is supported after https://github.com/GoogleContainerTools/skaffold/pull/5903

- Skaffold version: 2.8.0
- Operating system: Linux
- Installed via: skaffold.dev