Build 'simplatform' with GH Actions

[jadecarino]

Story

As a contributor to the galasa open source project, I want builds to be in the open, and use github actions, so that I can see build logs, see built artifacts, benefit from integration with github actions, and all without using any resources within the secretive IBM firewall.

Background

There are many benefits of moving our infrastructure to use github actions.

• Builds will be immediately kicked off, no 2-minute delay for them to start.
• build logs are available for ages
• built artifacts can be made available within the build results

Objectives:

• Now that we have learned more about GH Actions with the spike story #1719 , we can move on to recreating GH Actions builds for other components that are in the main build chain
• Side by side comparison with Tekton pipeline
• Try out the Docker registry

For reference, look at the existing Tekton pipelines for simplatform and the associated Tasks that it utilises, but remove/adapt Tasks as appropriate for GitHub actions.

Tasks

• [x] Use GitHub actions to build the 'simplatform' repository for Pull Requests and merges to Main
• [x] Build the simplatform application code with Maven (task maven-build-simplatform-application)
• [x] Build the simbank tests with Maven (task maven-build-simbank-tests)
• [x] Build the simplatform maven repo Docker image (task docker-build-simplatform-repo)
• [x] Build the simplatform jar Docker image (task docker-build-simplatform-jar)
• [x] For PR builds do not publish the images
• [x] For Main builds publish the images to GHCR
• [x] For Main builds recycle the ArgoCD app

[jadecarino]

Waiting for 0.36.0 release to merge in PR: https://github.com/galasa-dev/simplatform/pull/160

[jadecarino]

Not closed this off yet as the builds (both GH and Tekton) are failing for Simplatform which I'll investigate tomorrow.

[jadecarino]

The Simplatform Tekton and GH builds are failing since upgrading the builds to use Java 17, but without upgrading the Maven versions to 3.9.+. The Tekton build uses Maven 3.8.7 and the GH build uses 3.8.8. Tekton can be updated, but I've been searching but cannot find a way to set the Maven version you want in a GH Actions build. Since it's using less than Maven 3.9, it's using the maven-war-plugin at 2.2, which is incompatible with Java 17.

To get the GH build working, I'll have to update the galasa-simplatform-application pom.xml to state which maven-war-plugin to use as 3.3.2. I'll then also need to update the galasa-simplatform-application version to 0.37.0 (currently 0.24.0) as there's just a change to the pom.