Tekton Triggers stack addition

[v-ctiutiu]

Description

Tekton is a cloud native solution for building CI/CD systems. It is specifically engineered to run on Kubernetes, and empowers developers to create CI pipelines using reusable blocks.

Currently, the DigitalOcean 1-click apps marketplace provides the Tekton Pipelines core component. Tekton Triggers is a nice addition to Tekton Pipelines, empowering users to create CI flows that react to various external event sources (such as GitHub, for example).

Impacted Areas

None.

Solution

As per the contribution guideline, following steps must be performed:

1. Use the stack generator script provided in this repository (./stack-templates/generate-stack.sh), and have the required scripts created automatically.
2. Tweak as necessary the Helm chart values inside the values.yml file (usually we don't paste here the default values, because those will be merged anyways from the upstream values file of the Helm chart repository).
3. Validate that the scripts work as expected for each scenario (deploy/upgrade/uninstall).
4. Have the main README created, containing a quick start guide for Tekton Triggers.