Add the CA_TRUSTED env var as an empty string to K8s standalone (#10635)

This commit adds CA_TRUSTED as an empty string env var in the K8s
standalone manifest, without this env var set, the Elastic Agent fails
to parse the configuration with:
`rendering output "default" failed: no matching vars: ${env.CA_TRUSTED}`

Author: belimawr

deploy/kubernetes/elastic-agent-kustomize/default/elastic-agent-standalone/base/elastic-agent-standalone-daemonset.yaml

@@ -63,6 +63,10 @@ spec:
             # The Elasticsearch host to communicate with
             - name: ES_HOST
               value: ""
+            # The fingerprint of a root CA certificate used to sign
+            # Elasticsearch's TLS certificate
+            - name: CA_TRUSTED
+              value: ""
             - name: NODE_NAME
               valueFrom:
                 fieldRef:

deploy/kubernetes/elastic-agent-kustomize/ksm-autosharding/elastic-agent-standalone/base/elastic-agent-standalone-daemonset.yaml

@@ -63,6 +63,10 @@ spec:
             # The Elasticsearch host to communicate with
             - name: ES_HOST
               value: ""
+            # The fingerprint of a root CA certificate used to sign
+            # Elasticsearch's TLS certificate
+            - name: CA_TRUSTED
+              value: ""
             - name: NODE_NAME
               valueFrom:
                 fieldRef:

deploy/kubernetes/elastic-agent-kustomize/ksm-autosharding/elastic-agent-standalone/extra/elastic-agent-standalone-statefulset.yaml

@@ -63,6 +63,10 @@ spec:
             # The Elasticsearch host to communicate with
             - name: ES_HOST
               value: ""
+            # The fingerprint of a root CA certificate used to sign
+            # Elasticsearch's TLS certificate
+            - name: CA_TRUSTED
+              value: ""
             - name: NODE_NAME
               valueFrom:
                 fieldRef:

deploy/kubernetes/elastic-agent-standalone-kubernetes.yaml

@@ -739,6 +739,10 @@ spec:
             # The Elasticsearch host to communicate with
             - name: ES_HOST
               value: ""
+            # The fingerprint of a root CA certificate used to sign
+            # Elasticsearch's TLS certificate
+            - name: CA_TRUSTED
+              value: ""
             - name: NODE_NAME
               valueFrom:
                 fieldRef:

deploy/kubernetes/elastic-agent-standalone/elastic-agent-standalone-daemonset.yaml

@@ -63,6 +63,10 @@ spec:
             # The Elasticsearch host to communicate with
             - name: ES_HOST
               value: ""
+            # The fingerprint of a root CA certificate used to sign
+            # Elasticsearch's TLS certificate
+            - name: CA_TRUSTED
+              value: ""
             - name: NODE_NAME
               valueFrom:
                 fieldRef:

docs/manifests/elastic-agent-standalone-gke-autopilot.yaml

@@ -371,6 +371,10 @@ spec:
               value: "changeme"
             - name: ES_HOST
               value: "https://<url>.us-central1.gcp.cloud.es.io:443"
+            # The fingerprint of a root CA certificate used to sign
+            # Elasticsearch's TLS certificate
+            - name: CA_TRUSTED
+              value: ""
             - name: NODE_NAME
               valueFrom:
                 fieldRef:

testing/integration/k8s/testdata/elastic-agent-kustomize.yaml

@@ -705,6 +705,8 @@ spec:
           value: elastic
         - name: ES_PASSWORD
           value: changeme
+        - name: CA_TRUSTED
+          value: ""
         - name: NODE_NAME
           valueFrom:
             fieldRef: