fix: update container images to resolve CI failures

- Fix infra-crd-check image: use specific kubectl version (1.31.2) instead of :latest
- Fix postgres-backup deployment: make image configurable and update to postgresql 16.6.0
- Previous hardcoded images (kubectl:latest, postgresql:15.3.0-debian-11-r0) were causing ImagePullBackOff errors

These changes resolve CI test failures in both kots-install-test and helm-install-test.

Author: chris-sanders

applications/mlflow/charts/infra/values.yaml

@@ -8,7 +8,7 @@ crdCheck:
     # -- Image repository
     repository: bitnami/kubectl
     # -- Image tag
-    tag: latest
+    tag: "1.31.2"
   # -- CRDs to check
   crds:
     - name: tenants.minio.min.io

applications/mlflow/charts/mlflow/templates/postgres-backup-deployment.yaml

@@ -25,8 +25,8 @@ spec:
             defaultMode: 0777
       initContainers:
         - name: wait-for-postgresql
-          image: docker.io/bitnami/postgresql:15.3.0-debian-11-r0
-          imagePullPolicy: {{ .Values.mlflow.image.pullPolicy }}
+          image: "{{ .Values.postgres.backup.image.registry }}/{{ .Values.postgres.backup.image.repository }}:{{ .Values.postgres.backup.image.tag }}"
+          imagePullPolicy: {{ .Values.postgres.backup.image.pullPolicy }}
           command:
             [
               "sh",
@@ -37,8 +37,8 @@ spec:
             - secretRef:
                 name: {{ printf "%s-waitfor-postgres" (include "mlflow.fullname" .)  | trunc 63 | trimAll "-" }}
         - name: restore-db
-          image: docker.io/bitnami/postgresql:15.3.0-debian-11-r0
-          imagePullPolicy: {{ .Values.mlflow.image.pullPolicy }}
+          image: "{{ .Values.postgres.backup.image.registry }}/{{ .Values.postgres.backup.image.repository }}:{{ .Values.postgres.backup.image.tag }}"
+          imagePullPolicy: {{ .Values.postgres.backup.image.pullPolicy }}
           command: ["/bin/sh", "/scripts/db-restore.sh"]
           envFrom:
             - secretRef:
@@ -50,7 +50,7 @@ spec:
               mountPath: /scripts
       containers:
         - name: sleep
-          image: docker.io/bitnami/postgresql:15.3.0-debian-11-r0
+          image: "{{ .Values.postgres.backup.image.registry }}/{{ .Values.postgres.backup.image.repository }}:{{ .Values.postgres.backup.image.tag }}"
           command: ["sh", "-c", "sleep infinity"]
           envFrom:
               - secretRef:

applications/mlflow/charts/mlflow/values.yaml

@@ -688,3 +688,16 @@ postgres:
     port: 5432
     # -- External Postgres database
     database: mlflow
+
+  # -- Postgres backup configuration
+  backup:
+    # -- Image details for the postgres backup deployment
+    image:
+      # -- Image registry
+      registry: docker.io
+      # -- Image repository
+      repository: bitnami/postgresql
+      # -- Image tag
+      tag: "16.6.0"
+      # -- Image pull policy
+      pullPolicy: IfNotPresent