fix(external-dns): Adding support for PowerDNS provider (#41645)

**Description**
<!--
ExternalDNS supports PowerDNS provider. This change adds required
arguments for externalDNS to talk to PowerDNS server
-->
⚒️ 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
- [x] 📜 Documentation Changes

**🧪 How Has This Been Tested?**
<!--
Tested on a production environment toward an existing PowerDNS
installation
-->

**📃 Notes:**
<!-- Please enter any other relevant information here -->

**✔️ 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
- [x] 📄 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`

---

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---------

Signed-off-by: Christian Tardif <christian.tardif@servinfo.ca>

charts/stable/external-dns/Chart.yaml

@@ -38,5 +38,5 @@ sources:
   - https://github.com/kubernetes-sigs/external-dns
   - https://github.com/trueforge-org/truecharts/tree/master/charts/stable/external-dns
 type: application
-version: 7.12.3
+version: 7.12.4
 

charts/stable/external-dns/docs/setup-guide.md

@@ -15,7 +15,21 @@ Inspired by Kubernetes DNS, Kubernetes' cluster-internal DNS server, ExternalDNS
 
 ## Installation instructions
 
-This guide will cover 2 scenarios, `Cloudflare` and `Pi-hole`. For more external DNS record providers, see [External-DNS Docs](https://github.com/kubernetes-sigs/external-dns/tree/master/docs/tutorials).
+This guide will cover 3 scenarios, `Cloudflare`, `Pi-hole` and `PowerDNS`. For more external DNS record providers, see [External-DNS Docs](https://github.com/kubernetes-sigs/external-dns/tree/master/docs/tutorials).
+
+### PowerDNS
+
+These instructions taken from [external-dns powerdns tutorial](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/pdns.md)
+
+### Step 1
+
+Set pdns provider with externaldns.provider: pdns
+
+### Step 2
+
+Set externaldns.pdns.pdnsApiKey and externaldns.pdns.pdnsServerUrl. <br>
+The ApiKey must provide Zone Read/Write on all zones covered by domainFilters<br>
+The pdnsServerUrl is the full URL of the powerdns api endpoint, including the port (http://pdns-server-api.tld:9191/)
 
 ### Cloudflare
 

charts/stable/external-dns/templates/_args.tpl

@@ -51,4 +51,12 @@ args:
   {{- with .Values.externaldns.piholeAPIVersion }}
   - --pihole-api-version={{ . }}
   {{- end -}}
+  {{- if eq .Values.externaldns.provider "pdns" }}
+  {{- with .Values.externaldns.pdns.pdnsApiKey }}
+  - --pdns-api-key={{ . }}
+  {{- end -}}
+  {{- with .Values.externaldns.pdns.pdnsServerUrl }}
+  - --pdns-server={{ . }}
+  {{- end -}}
+  {{- end }}
 {{- end -}}

charts/stable/external-dns/values.yaml

@@ -20,6 +20,10 @@ externaldns:
   piholePassword: ""
   piholeAPIVersion: ""
   triggerLoopOnEvent: "false"
+  # with externaldns.provider = pdns
+  pdns:
+    pdnsApiKey: ""
+    pdnsServerUrl: ""
   txtOwnerId: ""
   txtPrefix: ""
   txtSuffix: ""