feat(mixpost): add mixpost (#18937)

**Description**

Add Mixpost as incubator chart

⚒️ 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

**🧪 How Has This Been Tested?**
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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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**📃 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.

- [x] 🖼️ 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.
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---------

Signed-off-by: StevenMcElligott <89483932+StevenMcElligott@users.noreply.github.com>
Signed-off-by: Kjeld Schouten <info@kjeldschouten.nl>
Co-authored-by: Geoffrey Byers <geoff@Ada.localdomain>
Co-authored-by: StevenMcElligott <89483932+StevenMcElligott@users.noreply.github.com>
Co-authored-by: Kjeld Schouten <info@kjeldschouten.nl>

charts/incubator/mixpost/Chart.yaml

@@ -0,0 +1,50 @@
+annotations:
+  truecharts.org/category: productivity
+  truecharts.org/max_helm_version: "3.14"
+  truecharts.org/min_helm_version: "3.11"
+  truecharts.org/train: incubator
+apiVersion: v2
+appVersion: 1.4.0
+dependencies:
+  - name: common
+    version: 23.0.10
+    repository: oci://tccr.io/truecharts
+    condition: ""
+    alias: ""
+    tags: []
+    import-values: []
+  - name: redis
+    version: 14.0.12
+    repository: oci://tccr.io/truecharts
+    condition: redis.enabled
+    alias: ""
+    tags: []
+    import-values: []
+  - name: mariadb
+    version: 14.0.12
+    repository: oci://tccr.io/truecharts
+    condition: mariadb.enabled
+    alias: ""
+    tags: []
+    import-values: []
+deprecated: false
+description: Mixpost it's the coolest Self hosted social media management software.
+home: https://truecharts.org/charts/incubator/mixpost
+icon: https://truecharts.org/img/hotlink-ok/chart-icons/mixpost.png
+keywords:
+  - mixpost
+  - twitter
+  - facebook
+  - socialmedia
+kubeVersion: ">=1.24.0-0"
+maintainers:
+  - name: TrueCharts
+    email: info@truecharts.org
+    url: https://truecharts.org
+name: mixpost
+sources:
+  - https://github.com/inovector/mixpost
+  - https://github.com/truecharts/charts/tree/master/charts/incubator/mixpost
+  - https://hub.docker.com/r/inovector/mixpost
+type: application
+version: 0.0.1

charts/incubator/mixpost/templates/common.yaml

@@ -0,0 +1,5 @@
+{{/* Make sure all variables are set properly */}}
+{{- include "tc.v1.common.loader.init" . -}}
+
+{{/* Render the templates */}}
+{{- include "tc.v1.common.loader.apply" . -}}

charts/incubator/mixpost/values.yaml

@@ -0,0 +1,67 @@
+image:
+  repository: inovector/mixpost
+  pullPolicy: IfNotPresent
+  tag: v1.4.0@sha256:f9c14360ad7af6e4b2f1bad518d2b2aa91646b0edb41fcb79bac2ee27fe9564c
+service:
+  main:
+    ports:
+      main:
+        targetPort: 80
+        port: 80
+persistence:
+  storage:
+    enabled: true
+    mountPath: "/var/www/html/storage/app"
+  logs:
+    enabled: true
+    mountPath: "/var/www/html/storage/logs"
+  varrun:
+    enabled: false  
+mariadb:
+  enabled: true
+  mariadbUsername: mixpost
+  mariadbDatabase: mixpost
+redis:
+  enabled: true
+  redisUsername: default
+securityContext:
+  container:
+    runAsNonRoot: false
+    readOnlyRootFilesystem: false
+    runAsUser: 0
+    runAsGroup: 0
+workload:
+  main:
+    podSpec:
+      containers:
+        main:
+          probes:
+            liveness:
+              type: tcp
+            startup:
+              type: tcp
+            readiness:
+              type: tcp
+          env:
+            DB_DATABASE: "{{ .Values.mariadb.mariadbDatabase }}"
+            DB_USERNAME: "{{ .Values.mariadb.mariadbUsername }}"
+            DB_HOST:
+              secretKeyRef:
+                expandObjectName: false
+                name: '{{ printf "%s-%s" .Release.Name "mariadbcreds" }}'
+                key: plainhost
+            DB_PASSWORD:
+              secretKeyRef:
+                expandObjectName: false
+                name: '{{ printf "%s-%s" .Release.Name "mariadbcreds" }}'
+                key: mariadb-password
+            REDIS_HOST:
+              secretKeyRef:
+                expandObjectName: false
+                name: '{{ printf "%s-%s" .Release.Name "rediscreds" }}'
+                key: plainhost
+            REDIS_PASSWORD:
+              secretKeyRef:
+                expandObjectName: false
+                name: '{{ printf "%s-%s" .Release.Name "rediscreds" }}'
+                key: redis-password