Merge pull request 'Add Gitea OAuth2/OIDC provider' (#13) from benvin/gitea-oidc into main

Reviewed-on: #13

config/providers_oauth2/gitea.yaml

@@ -0,0 +1,25 @@
+# OAuth2/OIDC provider + application for the k8s Gitea forge.
+# Redirect URIs cover both the temporary validation host (git2...) and the final
+# git.unkin.net cutover host, so SSO keeps working across the migration. The
+# path segment "authentik" is the Gitea OAuth2 login-source name — it must match
+# the source registered on the Gitea side. client_secret is read from Vault
+# (seeded out of band), never committed.
+name: Gitea
+authorization_flow: default-provider-authorization-implicit-consent
+invalidation_flow: default-provider-invalidation-flow
+client_type: confidential
+client_id: gitea
+client_secret_vault:
+  mount: kv
+  path: kubernetes/namespace/gitea/default/oauth-credentials
+scope_mappings:
+  - goauthentik.io/providers/oauth2/scope-openid
+  - goauthentik.io/providers/oauth2/scope-email
+  - goauthentik.io/providers/oauth2/scope-profile
+redirect_uris:
+  # Temporary validation host.
+  - matching_mode: strict
+    url: https://git2.k8s.syd1.au.unkin.net/user/oauth2/authentik/callback
+  # Final host (active after DNS/cert cutover).
+  - matching_mode: strict
+    url: https://git.unkin.net/user/oauth2/authentik/callback