Add support for Concourse

[pacphi]

So there's this chart: https://github.com/concourse/concourse-chart. Handle secrets, ingress, persistence and credentials management.

Have a look at Vault, here: https://www.vaultproject.io/docs/platform/k8s/helm/run. Setup Vault in HA mode.
Auto-unsealing requires a dependency on a KMS.

• GCP - https://learn.hashicorp.com/vault/day-one/autounseal-gcp-kms
• Azure - https://learn.hashicorp.com/vault/day-one/autounseal-azure-keyvault
• AWS - https://learn.hashicorp.com/vault/day-one/ops-autounseal-aws-kms

[pacphi]

Once Concourse is up-and-running, definitely want to take a look at https://github.com/techgnosis/deploy-petclinic to exercise a sample pipeline.

[pacphi]

Since I've been turned on to kubeseal and this corresponding helm chart, I decided to implement a much less ambitious experiment and module for Concourse. Essentially, I've opted for an embedded Postgresql and the simplest footprint, single instance web and worker.