(Kubernetes) - Add UDP Port Support for Pipeline Services

[J-Ha]

Clear and concise description of the problem

At the moment there is for at least the Kubernetes backend no option to specify the type of a service port.
kubernetes defaults this to TCP

Suggested solution

Add an option to specify the port kind, and keep tcp as default if nothing is defined

services:
  udpservice:
    image: image
    ports:
    - 1234/udp
  tcpservice:
    image: image
    ports:
    - 2345/tcp
 tcpservice2:
    image: image
    ports:
    - 3456

Alternative

No response

Additional context

No response

Validations

• Checked that the feature isn't part of the next version already [https://woodpecker-ci.org/faq#which-version-of-woodpecker-should-i-use]
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.