feat(custom-app) Enable Options for Configuring Portal & bump app version (#8805)

**Description**
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Please include a summary of the change and which issue is fixed. Please
also include relevant motivation and context. List any dependencies that
are required for this change.
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Adds support to custom-app to enable/disable the web portal as well as
configure override settings for the port/host/protocol.

⚒️ Fixes  # <!--(issue)--> #8793

**⚙️ Type of change**

- [x] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**
<!--
Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce. Please also list any relevant details
for your test configuration
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I copied my updated section of questions.yaml into the questions.yaml in
my personal catalog and installed various scenarios of
enabling/disabling and overriding parameters.

**📃 Notes:**
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**✔️ Checklist:**

- [ ] ⚖️ My code follows the style guidelines of this project
- [ ] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [x] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

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charts/stable/custom-app/Chart.yaml

@@ -19,7 +19,7 @@ name: custom-app
 sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/custom-app
 type: application
-version: 8.0.7
+version: 8.0.8
 annotations:
   truecharts.org/catagories: |
     - custom

charts/stable/custom-app/questions.yaml

@@ -154,6 +154,65 @@ questions:
                                                     schema:
                                                       type: string
                                                       default: "/"
+  - variable: portal
+    group: "General Settings"
+    label: "Portal Configuration"
+    schema:
+      type: dict
+      additional_attrs: true
+      attrs:
+        - variable: open
+          label: "Open"
+          schema:
+            type: dict
+            additional_attrs: true
+            attrs:
+              - variable: enabled
+                label: "Enable WebUI Portal"
+                description: "Enable WebUI Portal"
+                schema:
+                  type: boolean
+                  default: true
+              - variable: overrides
+                label: "Override Portal Configuration"
+                description: "Override Portal Configuration"
+                schema:
+                  type: boolean
+                  default: false
+                  show_if: [["enabled", "=", true]]
+                  show_subquestions_if: true
+                  subquestions:
+                    - variable: override
+                      label: "Override Portal Configuration"
+                      description: "Override Portal Configuration"
+                      schema:
+                        type: dict
+                        additional_attrs: true
+                        attrs:
+                          - variable: protocol
+                            label: "Protocol"
+                            description: "Portal Protocol Override"
+                            schema:
+                              type: string
+                              enum:
+                                - value: ""
+                                  description: ""
+                                - value: "http"
+                                  description: "HTTP"
+                                - value: "https"
+                                  description: "HTTPS"
+                          - variable: host
+                            label: "Host"
+                            description: "Portal Host Override"
+                            schema:
+                              type: string
+                              default: ""
+                          - variable: port
+                            label: "Port"
+                            description: "Portal Port Override"
+                            schema:
+                              type: string
+                              default: ""
 # Include{containerConfig}
 # Include{podOptions}
 # Include{serviceRoot}