Strip dashes and equal signs in recorded parameters
Strip dashes and equal signs in recorded parameters

krel arguments recorded in the provenance attestation were recorded
with dashes and equal signs:

```
 "arguments": {
        "--branch=": "master",
```

This commit fixes them to record just the name of the parameter.

Signed-off-by: Adolfo García Veytia <9de42c8261a7cacaae239656a4dd6991d9b9250f@uservers.net>

kubernetes/release,kubernetes/release