add test app for middleware

ix-dev/test/nginx/app.yaml

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+name: nginx
+train: test
+# lib_version: 1.0.0
+version: 1.0.0
+
+title: Nginx
+description: Nginx description
+containerVersion: 1.0.0
+home: https://github.com/AdguardTeam/AdGuardHome
+icon: https://media.sys.truenas.net/apps/adguard-home/icons/icon.svg
+categories:
+  - networking
+screenshots:
+  - https://media.sys.truenas.net/apps/adguard-home/screenshots/screenshot1.png
+  - https://media.sys.truenas.net/apps/adguard-home/screenshots/screenshot2.png
+sources:
+  - https://github.com/AdguardTeam/AdGuardHome
+  - https://github.com/truenas/charts/tree/master/community/adguard-home
+  - https://hub.docker.com/r/adguard/adguardhome
+keywords:
+  - dns
+  - adblock

ix-dev/test/nginx/questions.yaml

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+groups:
+  - name: Network Configuration
+    description: Configure Network for Nginx
+
+questions:
+  - variable: network
+    label: ""
+    group: Network Configuration
+    schema:
+      type: dict
+      attrs:
+        - variable: web_port
+          label: WebUI Port
+          description: The port for Nginx WebUI
+          schema:
+            type: int
+            default: 8080
+            required: true

ix-dev/test/nginx/templates/docker-compose.yaml

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+x-values: {{ values.some_value | tojson }}
+services:
+  {{ ix_lib.test.container_name() }}:
+    image: nginx
+    ports:
+      - {{ values.network.web_port }}:80

ix-dev/test/nginx/templates/library/base_v1_0_0/test.py

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+def container_name():
+    return "nginx"

ix-dev/test/nginx/templates/test_values/basic-values.yaml

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+some_key: some_value

library/test.py

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+def container_name():
+    return "nginx"