added github action, updates to pom for automatic release to maven central

[xgp]

Prerequisite steps:

• https://central.sonatype.org/register/central-portal/
• set all of the secrets for maven central, your GPG key and your SSH key in github settings

Notes:

• the action is currently set up to trigger on a merge to main. this will version and publish the artifact every time a merge is made. not sure if that's what you want.

[xgp]

Setup for #50

[xgp]

@robinbraemer This is essentially ready to go. In order to proceed and try to merge it you would need to:

1. Tell me if it is a correct assumption that you want it to automatically publish to maven central when a merge is made to main. If not, let me know how you want to trigger the action.
2. As in the prerequisites above,
   a. Set up a maven central / sonatype account, and set the OSSRH_USERNAME and OSSRH_PASSWORD as repository secrets
   b. Set your GPG_KEY_ID and GPG_KEY (public!) as repository secrets. You'll need to create a GPG key if you don't have one already
   c. Set an SSH_PRIVATE_KEY as a repository secret. I prefer to make a separate SSH keypair for each repository so if one gets compromised, you can always just diable it. To generate and upload a new key to Github, you can follow this guide.

Please let me know if I can help or answer any questions. Thank you again!

[robinbraemer]

Thank you! Why did you close?

[xgp]

I was under time pressure and I used a different approach to call the Cloudflare API, so I no longer need the library in Maven Central.