Demo: Publishing a Java package to Maven Central using Github Actions (…

…#955)

Co-authored-by: César Soto Valero <cesarsotovalero@gmail.com>

contributions/demo/axp-fseifert/README.md

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+# Video demo: Publishing a Java package to Maven Central using Github Actions
+
+## Members
+
+Axel Pettersson (axp@kth.se)
+GitHub: [Ackuq](https://github.com/Ackuq)
+
+Felix Seifert (fseifert@kth.se)
+Github: [felix-seifert](https://github.com/felix-seifert)
+
+## Proposal
+
+In this demo we will show how to create a simple Java package and deploying it to Maven Central for distribution using Github Actions.
+
+The action will:
+
+-   run when commits are pushed to main branch
+-   update the version of the artifact to be published
+-   authenticate with Maven Central
+-   use encrypted Github Secrets to securely handle authentication