fix: use init-container instead of postStart hook

apps/production/element-web-docs-server.yaml

@@ -13,31 +13,34 @@ spec:
       labels:
         app: element-web-docs
     spec:
+      initContainers:
+      - name: copy-files
+        image: busybox:1.36
+        command: ["/bin/sh", "-c"]
+        args:
+        - |
+          mkdir -p /html/docs/setup
+          cp /config/README-Element-Setup.md /html/docs/setup/
+          cp /config/element-setup-windows.cmd /html/docs/setup/
+          cp /config/element-setup-macos.command /html/docs/setup/
+          cp /config/element-setup-linux.sh /html/docs/setup/
+          chmod 644 /html/docs/setup/*
+        volumeMounts:
+        - name: config
+          mountPath: /config
+        - name: html
+          mountPath: /html
       containers:
       - name: nginx
         image: nginx:1.26-alpine
         ports:
         - containerPort: 8080
         volumeMounts:
-        - name: config
-          mountPath: /config
         - name: nginx-conf
           mountPath: /etc/nginx/conf.d/default.conf
           subPath: nginx.conf
         - name: html
           mountPath: /usr/share/nginx/html
-        lifecycle:
-          postStart:
-            exec:
-              command: ["/bin/sh", "-c"]
-              args:
-              - |
-                mkdir -p /usr/share/nginx/html/docs/setup
-                cp /config/README-Element-Setup.md /usr/share/nginx/html/docs/setup/
-                cp /config/element-setup-windows.cmd /usr/share/nginx/html/docs/setup/
-                cp /config/element-setup-macos.command /usr/share/nginx/html/docs/setup/
-                cp /config/element-setup-linux.sh /usr/share/nginx/html/docs/setup/
-                chmod 644 /usr/share/nginx/html/docs/setup/*
       volumes:
       - name: config
         configMap: