Add PHP base metadata structure assertions

Co-authored-by: Kanti <471387+Kanti@users.noreply.github.com>

Author: Copilot

tests/structure-test/php/test.yaml

@@ -1,8 +1,22 @@
 schemaVersion: "2.0.0"
 
 metadataTest:
+  entrypoint: ["/entrypoint"]
+  cmd: ["supervisord"]
   exposedPorts: ["9000"]
   envVars:
+    - key: "LC_ALL"
+      value: "C.UTF-8"
+    - key: "LANG"
+      value: "C.UTF-8"
+    - key: "TERM"
+      value: "xterm"
+    - key: "DOCKER_CONF_HOME"
+      value: "/opt/docker/"
+    - key: "LOG_STDOUT"
+      value: ""
+    - key: "LOG_STDERR"
+      value: ""
     - key: "APPLICATION_USER"
       value: "application"
     - key: "APPLICATION_GROUP"