Updated helm chart and dockerfile dependencies (#540)

* Updated Helm chart to use hapi fhir image v6.6.0

* Updated maven base image due to openjdk deprecation

* Removed superfluous app/main.war in entrypoint

* Update curlimages/curl to 8.1.2

.github/ct/config.yaml

@@ -11,6 +11,4 @@ helm-extra-args: --timeout 300s
 upgrade: true
 skip-missing-values: true
 release-label: release
-chart-repos:
-  - bitnami=https://charts.bitnami.com/bitnami
 release-name-template: "helm-v{{ .Version }}"