feat(ntfy): Add nfty_upstream_base_url env var (#17314)

**Description**

Since I may want to you use this figure I may as well add it myself to
the defaults

⚒️ Fixes  #16919 

**⚙️ Type of change**

- [ ] ⚙️ 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?**
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**📃 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
- [ ] ⬆️ 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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---------

Signed-off-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>
Co-authored-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>

charts/stable/ntfy/Chart.yaml

@@ -33,4 +33,4 @@ sources:
   - https://hub.docker.com/r/binwiederhier/ntfy
   - https://github.com/binwiederhier/ntfy/
 type: application
-version: 8.1.6
+version: 8.2.0

charts/stable/ntfy/questions.yaml

@@ -59,6 +59,12 @@ questions:
                                           type: string
                                           required: true
                                           default: "1m"
+                                      - variable: NTFY_UPSTREAM_BASE_URL
+                                        label: "Upstream Base URL"
+                                        description: "Needed for iOS Push Notifications"
+                                        schema:
+                                          type: string
+                                          default: "https://ntfy.sh"
                                       - variable: NTFY_GLOBAL_TOPIC_LIMIT
                                         label: "Global Topic Limit"
                                         description: "Rate limiting: Total number of topics before the server rejects new topics."

charts/stable/ntfy/values.yaml

@@ -50,6 +50,7 @@ workload:
             ENABLE_ATTACHMENT_CACHE_DIR: false
             ENABLE_AUTH_FILE: false
             NTFY_ENABLE_METRICS: "{{ .Values.metrics.main.enabled }}"
+            NTFY_UPSTREAM_BASE_URL: "https://ntfy.sh"
             # NTFY_CACHE_DURATION: "12h"
             # NTFY_KEEPALIVE_INTERVAL: "45s"
             # NTFY_MANAGER_INTERVAL: "1m"