Add custom image support for all Helm chart components

- Add initContainer.image config for busybox (wait containers)
- Add image config for PostgreSQL, MinIO, Redis subcharts
- Update deployment.yaml and migration-job.yaml to use configurable images
- Enables air-gapped deployments with private registries

helm/orchard/templates/deployment.yaml

@@ -35,12 +35,14 @@ spec:
       initContainers:
         {{- if .Values.migrations.enabled }}
         - name: wait-for-db
-          image: busybox:1.36
+          image: "{{ .Values.initContainer.image.repository }}:{{ .Values.initContainer.image.tag }}"
+          imagePullPolicy: {{ .Values.initContainer.image.pullPolicy }}
           command: ['sh', '-c', 'until nc -z {{ include "orchard.postgresql.host" . }} 5432; do echo waiting for database; sleep 2; done;']
         {{- end }}
         {{- if .Values.minio.enabled }}
         - name: wait-for-minio
-          image: busybox:1.36
+          image: "{{ .Values.initContainer.image.repository }}:{{ .Values.initContainer.image.tag }}"
+          imagePullPolicy: {{ .Values.initContainer.image.pullPolicy }}
           command: ['sh', '-c', 'until nc -z {{ .Release.Name }}-minio 9000; do echo waiting for minio; sleep 2; done;']
         {{- end }}
       containers: