feat(integrations): add support for Discourse (#2699)

## Describe your changes

- Add support for Discourse

## Issue ticket number and link

[EXT-133](https://linear.app/nango/issue/EXT-133/add-support-for-discourse-api)

docs-v2/integrations/all/discourse.mdx

@@ -0,0 +1,31 @@
+---
+title: Discourse
+sidebarTitle: Discourse
+---
+
+API configuration: [`discourse`](https://nango.dev/providers.yaml)
+
+## Features
+
+| Features | Status |
+| - | - |
+| [Auth (API Key)](/integrate/guides/authorize-an-api) | ✅ |
+| [Sync data](/integrate/guides/sync-data-from-an-api) | ✅ |
+| [Perform workflows](/integrate/guides/perform-workflows-with-an-api) | ✅ |
+| [Proxy requests](/integrate/guides/proxy-requests-to-an-api) | ✅ |
+| [Receive webhooks](/integrate/guides/receive-webhooks-from-an-api) | 🚫 (time to contribute: <48h) |
+
+<Tip>We can implement missing features in &lt;48h, just ask for it in the [community](https://nango.dev/slack).</Tip>
+
+## Getting started
+
+-   [Discourse API docs](https://docs.discourse.org)
+
+<Tip>Need help getting started? Get help in the [community](https://nango.dev/slack).</Tip>
+
+## API gotchas
+
+- Discourse uses API_KEY authentication mode with `Api-Key: apiKey` and `Api-Username: API Username` in the request header to access different endpoints. Both keys can be obtained from the admin panel.
+- Since Nango automatically sets the `Accept: application/json` header, there is no need to include the `.json` suffix in API endpoint URLs. For example, instead of sending a request to `/categories.json`, you can send it to `/categories`, and the JSON response will still be returned.
+
+<Note>Add Getting Started links and Gotchas by [editing this page](https://github.com/nangohq/nango/tree/master/docs-v2/integrations/all/discourse.mdx)</Note>

docs-v2/integrations/communication.mdx

@@ -15,6 +15,7 @@ sidebarTitle: Communication
     <Card title="Circle.so" href="/integrations/all/circle-so" color="#68a063" />
     <Card title="Dialpad" href="/integrations/all/dialpad" color="#68a063" />
     <Card title="Discord" href="/integrations/all/discord" color="#68a063" />
+    <Card title="Discourse" href="/integrations/all/discourse" color="#68a063" />
     <Card title="Facebook" href="/integrations/all/facebook" color="#68a063" />
     <Card title="Fireflies" href="/integrations/all/fireflies" color="#68a063" />
     <Card title="Front" href="/integrations/all/front" color="#68a063" />

docs-v2/mint.json

@@ -364,6 +364,7 @@
                 "integrations/all/dialpad",
                 "integrations/all/digitalocean",
                 "integrations/all/discord",
+                "integrations/all/discourse",
                 "integrations/all/dropbox",
                 "integrations/all/docusign",
                 "integrations/all/e-conomic",

packages/shared/providers.yaml

@@ -854,6 +854,17 @@ discord:
         retry:
             after: 'Retry-After'
     docs: https://docs.nango.dev/integrations/all/discord
+discourse:
+    categories:
+        - communication
+    auth_mode: API_KEY
+    proxy:
+        base_url: https://${connectionConfig.defaultHost}
+        headers:
+            Api-Username: ${connectionConfig.apiUsername}
+            Api-Key: ${apiKey}
+            Accept: application/json
+    docs: https://docs.nango.dev/integrations/all/discourse
 docusign:
     categories:
         - legal