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Avro Byte fields cannot be mapped-

After merging a PR the new image should be pushed to docker hub, to be accessible without the need of building it.

Since github actions are available, they should be used, since they make the use of an external tool unnecessary.

When using optional types, the avro generator creates a union struct representing the type. When trying to create a new instance of the record, it fails with 2021/01/05 08:35:43 int not supported.

This is caused by the type definition in the union:

type UnionNullBytesTypeEnum int

const (
	UnionNullBytesTypeEnumBytes UnionNullBytesTypeEnum = 1
)

type UnionNullBytes struct {
	Null      *types.NullVal
	Bytes     []byte
	UnionType UnionNullBytesTypeEnum
}

The optional field is defined as follows:

{
      "name": "image",
      "type": [
          "null",
          "bytes"
      ]
},