incompatible plugin when running inside jenkins operator

### Version report

Jenkins and plugins versions report:

unable to retrieve due to jenkins entering a loop

- Jenkins alpine container

### Reproduction steps

- install jenkins kubernetes operator
- add
```
- name: google-cloudbuild
version: "0.2.5"
```

### Results

Jenkins becomes available with expected plugin version

Actual result:

jenkins installs plugin but continually restarts logs crom the contoller show:
```
Incompatible plugin '{google-cloudbuild 0.2.5 }' version, actual '0.2.5 (2021-05-05T22:25:50Z)' {"cr": "jenkins"}
```

seems to be something amiss with the build date ending up in the version field somehow?

looking META-INF/MANIFEST.MF in the built hpi
```
Plugin-Version: 0.2.5 (2021-05-05T22:25:50Z)
```

is incorrect and is an invalid plugin version