feat(test): add e2e tests for openid (#1178)

.github/workflows/test.yml

@@ -298,6 +298,11 @@ jobs:
     needs:
       - api-build
       - frontend-build
+    services:
+      dex:
+        image: ghcr.io/go-vikunja/dex-testing:main
+        ports:
+          - 5556:5556
     strategy:
       # when one test fails, DO NOT cancel the other
       # containers, because this will kill Cypress processes
@@ -339,6 +344,11 @@ jobs:
           VIKUNJA_DATABASE_PATH: memory
           VIKUNJA_DATABASE_TYPE: sqlite
           VIKUNJA_RATELIMIT_NOAUTHLIMIT: 1000
+          VIKUNJA_AUTH_OPENID_ENABLED: 1
+          VIKUNJA_AUTH_OPENID_PROVIDERS_DEX_NAME: Dex
+          VIKUNJA_AUTH_OPENID_PROVIDERS_DEX_AUTHURL: http://dex:5556
+          VIKUNJA_AUTH_OPENID_PROVIDERS_DEX_CLIENTID: vikunja
+          VIKUNJA_AUTH_OPENID_PROVIDERS_DEX_CLIENTSECRET: secret
         with:
           install: false
           working-directory: frontend