Add guides for common OIDC providers

wip

Signed-off-by: Max Jonas Werner <mail@makk.es>

website/docs/guides/oidc.mdx

@@ -0,0 +1,73 @@
+---
+title: Common OIDC provider configurations
+hide_title: true
+---
+
+# Common OIDC provider configurations
+
+## Google
+
+### Obtaining client ID and secret
+
+Follow the [official guide](https://developers.google.com/identity/openid-connect/openid-connect) from Google to obtain client ID and secret.
+
+### Configuring Weave GitOps
+
+```yaml
+apiVersion: v1
+kind: Secret
+type: Opaque
+stringData:
+    clientID: YOUR_CLIENT_ID
+    clientSecret: YOUR_CLIENT_SECRET
+    issuerURL: https://accounts.google.com
+    redirectURL: http://YOUR_WEAVE_GITOPS_DOMAIN/oauth2/callback
+    customScopes: openid,email
+metadata:
+  name: oidc-auth
+[...]
+```
+
+## Azure AD
+
+### Obtaining client ID and secret
+
+Follow the [official guide](https://learn.microsoft.com/en-us/azure/active-directory/develop/quickstart-register-app) from Microsoft to obtain client ID and secret.
+
+### Configuring Weave GitOps
+
+```yaml
+apiVersion: v1
+kind: Secret
+type: Opaque
+stringData:
+    clientID: YOUR_CLIENT_ID
+    clientSecret: YOUR_CLIENT_SECRET
+    issuerURL: https://login.microsoftonline.com/TENANT_ID/v2.0
+    redirectURL: http://YOUR_WEAVE_GITOPS_DOMAIN/oauth2/callback
+    customScopes: openid
+    claimUsername: sub
+metadata:
+    name: oidc-auth
+[...]
+```
+
+## Keycloak
+
+### Obtaining client ID and secret
+
+tbd
+
+### Configuring Weave GitOps
+
+```yaml
+apiVersion: v1
+kind: Secret
+stringData:
+    clientID: YOUR_CLIENT_ID
+    clientSecret: YOUR_CLIENT_SECRET
+    issuerURL: https://KEYCLOAK_DOMAIN/realms/KEYCLOAK_REALM
+    redirectURL: https://YOUR_WEAVE_GITOPS_DOMAIN/oauth2/callback
+metadata:
+  name: oidc-auth
+[...]

website/sidebars.js

@@ -136,6 +136,7 @@
       label: 'Guides',
       items: [
         'guides/setting-up-dex',
+        'guides/oidc',
         'guides/displaying-custom-metadata',
         'guides/fluxga-upgrade',
       ],