feat(nebula-sync): Add nebula-sync (#37740)

**Description**
Adds nebula-sync for Pi-hole v6 syncronisation.
See https://github.com/lovelaze/nebula-sync

⚒️ Fixes  # <!--(issue)-->

**⚙️ 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
- [ ] 📜 Documentation Changes

**🧪 How Has This Been Tested?**
By app-template, works.

**📃 Notes:**
No icon available.

**✔️ Checklist:**

- [X] ⚖️ My code follows the style guidelines of this project
- [X] 👀 I have performed a self-review of my own code
- [X] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made changes to the documentation
- [ ] 🧪 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
- [X] I made sure the title starts with `feat(chart-name):`,
`fix(chart-name):`, `chore(chart-name):`, `docs(chart-name):` or
`fix(docs):`

**➕ App addition**

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

- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

_Please don't blindly check all the boxes. Read them and only check
those that apply.
Those checkboxes are there for the reviewer to see what is this all
about and
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.github/ct-install.yaml

@@ -11,6 +11,7 @@ chart-dirs:
   - charts/system
 excluded-charts:
   - charts/dependency/subchart
+  - charts/incubator/nebula-sync
   - charts/library/common
   - charts/stable/adguardhome-sync
   - charts/stable/alertmanager-bot

charts/incubator/nebula-sync/.helmignore

@@ -0,0 +1,32 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/
+# OWNERS file for Kubernetes
+OWNERS
+# helm-docs templates
+*.gotmpl
+# docs folder
+/docs
+# icon
+icon.png
+icon.webp
+icon-small.webp

charts/incubator/nebula-sync/CHANGELOG.md

@@ -0,0 +1,4 @@
+---
+title: Changelog
+pagefind: false
+---

charts/incubator/nebula-sync/Chart.yaml

@@ -0,0 +1,38 @@
+annotations:
+  artifacthub.io/links: |-
+    - name: support
+    url: https://discord.com/invite/tVsPTHWTtr
+  truecharts.org/category: networking
+  truecharts.org/max_helm_version: "3.17"
+  truecharts.org/min_helm_version: "3.14"
+  truecharts.org/train: incubator
+apiVersion: v2
+appVersion: v0.11.0
+dependencies:
+  - name: common
+    version: 28.13.0
+    repository: oci://tccr.io/truecharts
+    condition: ""
+    alias: ""
+    tags: []
+    import-values: []
+deprecated: false
+description: Synchronize Pi-hole v6.x configuration to replicas.
+home: https://truecharts.org/charts/incubator/nebula-sync
+icon: https://truecharts.org/img/hotlink-ok/chart-icons/nebula-sync.webp
+keywords:
+  - pihole
+  - sync
+  - adblocking
+kubeVersion: '>=1.24.0-0'
+maintainers:
+  - name: TrueCharts
+    email: info@truecharts.org
+    url: https://truecharts.org
+name: nebula-sync
+sources:
+  - https://ghcr.io/lovelaze/nebula-sync
+  - https://github.com/truecharts/charts/tree/master/charts/incubator/nebula-sync
+type: application
+version: 0.1.0
+

charts/incubator/nebula-sync/README.md

@@ -0,0 +1,3 @@
+---
+title: README
+---

charts/incubator/nebula-sync/templates/NOTES.txt

@@ -0,0 +1 @@
+{{- include "tc.v1.common.lib.chart.notes" $ -}}

charts/incubator/nebula-sync/templates/common.yaml

@@ -0,0 +1 @@
+{{ include "tc.v1.common.loader.all" . }}

charts/incubator/nebula-sync/values.yaml

@@ -0,0 +1,51 @@
+image:
+  repository: ghcr.io/lovelaze/nebula-sync
+  pullPolicy: IfNotPresent
+  tag: v0.11.0@sha256:17177eb65637d73eee7169a789e69eda8395d4d4398cc0cd08e2cbeb7c2910f1
+
+service:
+  main:
+    ports:
+      main:
+        port: 8080
+workload:
+  main:
+    podSpec:
+      containers:
+        main:
+          probes:
+            liveness:
+              path: /health
+            startup:
+              path: /health
+            readiness:
+              path: /health
+          env:
+            # Basic configuration
+            PRIMARY: "pi.hole|password"
+            REPLICAS: "pi2.hole|password"
+            FULL_SYNC: "false"
+            RUN_GRAVITY: "false"
+            CLIENT_SKIP_TLS_VERIFICATION: "true"
+            CRON: "*/15 * * * *"
+
+            # Sync configuration options
+            SYNC_CONFIG_DNS: "true"
+            SYNC_CONFIG_DHCP: "false"
+            SYNC_CONFIG_NTP: "false"
+            SYNC_CONFIG_RESOLVER: "false"
+            SYNC_CONFIG_DATABASE: "false"
+            SYNC_CONFIG_MISC: "false"
+            SYNC_CONFIG_DEBUG: "false"
+            # TrueCharts Pi-hole chart defines upstream dns servers in "env" which can't be overwritten at runtime
+            SYNC_CONFIG_DNS_EXCLUDE: "upstreams"
+
+            # Sync gravity options
+            SYNC_GRAVITY_DHCP_LEASES: "false"
+            SYNC_GRAVITY_GROUP: "false"
+            SYNC_GRAVITY_AD_LIST: "true"
+            SYNC_GRAVITY_AD_LIST_BY_GROUP: "true"
+            SYNC_GRAVITY_DOMAIN_LIST: "true"
+            SYNC_GRAVITY_DOMAIN_LIST_BY_GROUP: "true"
+            SYNC_GRAVITY_CLIENT: "false"
+            SYNC_GRAVITY_CLIENT_BY_GROUP: "false"