Add self-hosted configuration docs for GitHub, GitLab, GCP SM, Vercel, Heroku, Netlify, Azure KV

docs/integrations/cloud/gcp-secret-manager.mdx

@@ -3,7 +3,9 @@ title: "GCP Secret Manager"
 description: "How to sync secrets from Infisical to GCP Secret Manager"
 ---
 
-Prerequisites:
+<Tabs>
+  <Tab title="Usage">
+  Prerequisites:
 
 - Set up and add envars to [Infisical Cloud](https://app.infisical.com)
 
@@ -15,7 +17,7 @@ Prerequisites:
 
 Press on the GCP Secret Manager tile and grant Infisical access to GCP.
 
-![integrations GCP authorization](../../images/integrations-gcp-secret-manager-auth.png)
+![integrations GCP authorization](../../images/integrations/gcp-secret-manager/integrations-gcp-secret-manager-auth.png)
 
 <Info>
   If this is your project's first cloud integration, then you'll have to grant
@@ -28,10 +30,42 @@ Press on the GCP Secret Manager tile and grant Infisical access to GCP.
 
 Select which Infisical environment secrets you want to sync to which GCP secret manager project. Lastly, press create integration to start syncing secrets to GCP secret manager.
 
-![integrations GCP secret manager](../../images/integrations-gcp-secret-manager-create.png)
-![integrations GCP secret manager](../../images/integrations-gcp-secret-manager.png)
+![integrations GCP secret manager](../../images/integrations/gcp-secret-manager/integrations-gcp-secret-manager-create.png)
+![integrations GCP secret manager](../../images/integrations/gcp-secret-manager/integrations-gcp-secret-manager.png)
 
 <Warning>
     Using Infisical to sync secrets to GCP Secret Manager requires that you enable
     the Service Usage API in the Google Cloud project you want to sync secrets to. More on that [here](https://cloud.google.com/service-usage/docs/set-up-development-environment).
-</Warning>
+</Warning>
+  </Tab>
+  <Tab title="Self-Hosted Setup">
+  Using the GCP Secret Manager integration on a self-hosted instance of Infisical requires configuring an OAuth2 application in GCP
+  and registering your instance with it.
+  
+  ## Create an OAuth2 application in GCP
+  
+  Navigate to your project API & Services > Credentials to create a new OAuth2 application.
+   
+   ![integrations GCP secret manager config](../../images/integrations/gcp-secret-manager/integrations-gcp-secret-manager-config-api-services.png) 
+   ![integrations GCP secret manager config](../../images/integrations/gcp-secret-manager/integrations-gcp-secret-manager-config-new-app.png) 
+    
+    Create the application. As part of the form, add to **Authorized redirect URIs**: `https://your-domain.com/integrations/gitlab/oauth2/callback`.
+   
+   ![integrations GCP secret manager config](../../images/integrations/gcp-secret-manager/integrations-gcp-secret-manager-config-new-app-form.png) 
+   
+   ## Add your OAuth2 application credentials to Infisical
+   
+   Obtain the **Client ID** and **Client Secret** for your GCP OAuth2 application.
+   
+   ![integrations GCP secret manager config](../../images/integrations/gcp-secret-manager/integrations-gcp-secret-manager-config-credentials.png) 
+   
+   Back in your Infisical instance, add two new environment variables for the credentials of your GCP OAuth2 application:
+
+   - `CLIENT_ID_GCP_SECRET_MANAGER`: The **Client ID** of your GCP OAuth2 application.
+   - `CLIENT_SECRET_GCP_SECRET_MANAGER`: The **Client Secret** of your GCP OAuth2 application.
+   
+  Once added, restart your Infisical instance and use the GCP Secret Manager integration.
+
+  </Tab>
+</Tabs>
+