integration: add gitea to integrations (#131)

Author: CodeShellDev

docs/integrations/gitea/gitea.md

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+---
+title: Gitea
+---
+
+# Gitea
+
+Here's how you can use **Secured Signal API** as a notification service for gitea.
+
+## Setup
+
+### 1. Message Template
+
+Because gitea's webhook data is very _clustered_, we need to use [**Message Templates**](../../configuration/message-template) to ensure correct message rendering.
+
+Here is an example:
+
+```yaml
+{{{ #://./message-template.yml }}}
+```
+
+Add this to your token config and modify it to your needs.
+
+### 2. Webhook
+
+Head to your gitea repository (or user settings) and go to `Settings > Webhooks` and create a new Gitea webhook.
+
+![Webhook](/integrations/gitea/webhook.png)
+
+## Testing
+
+After you've completed the Setup you can try out your new notification integration:
+
+![Example Issue](/integrations/gitea/issue.png)
+
+```markdown
+📝 **#1 Very Important Issue**  
+🟢 | 👤 User
+🔗 https://gitea.domain.com/user/repo/issues/1
+```
+
+## Features
+
+The provided Message Template currently supports:
+
+- issues
+- commits
+- pull requests

docs/integrations/gitea/message-template.yml

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+settings:
+  message:
+    template: |
+      {{- if and @issue (ne @issue nil) (not @is_pull) -}}
+      📝 **#{{@issue.number}} {{@issue.title}}**  
+      {{ if eq @issue.state "open" -}}🟢{{- else if eq @issue.state "closed" -}}🔴{{- else -}}{{@issue.state}}{{- end }} | 👤 {{@sender.full_name}}
+      🔗 {{@issue.html_url}}
+      {{- end -}}
+
+      {{- if and @pull_request (ne @pull_request nil) -}}
+      🚀 **#{{@pull_request.number}} {{@pull_request.title}}**  
+      {{ if eq @pull_request.state "open" -}}🟢{{- else if eq @pull_request.state "closed" -}}🔴{{- else if eq @pull_request.state "merged" -}}🟣{{- else -}}{{@pull_request.state}}{{- end }} | 👤 {{@sender.full_name}}
+      🔗 {{@pull_request.html_url}}
+      {{- end -}}
+
+      {{- if and @commits (gt (len @commits) 0) }}
+      📥️ **Push** → *{{@ref}}*  
+      📁 {{@repository.full_name}} | 👤 {{@pusher.full_name}} | 🔢 {{@total_commits}}  
+      {{- range @commits }}
+      - 🧾 *{{.message}}*  
+        {{- if .added }}
+          {{- range .added }}➕ {{.}} {{- end }}
+        {{- end -}}
+        {{- if .modified }}
+          {{- range .modified }} ✏️ {{.}} {{- end }}
+        {{- end -}}
+        {{- if .removed }}
+          {{- range .removed }} ❌ {{.}} {{- end }}
+        {{- end }}
+        🔗 {{.url}}
+      {{- end }}
+
+      🔎 Compare: {{@compare_url}}
+      {{- end -}}