ci: enable manual trigger, align Google env, bump test model (#10)

- ci.yml: add workflow_dispatch so CI can be triggered manually
  via GitHub UI or `gh workflow run`
- ci.yml: integration job now also runs on workflow_dispatch
  (PRs remain excluded to preserve cost / security)
- ci.yml: rename CI-exposed env var GOOGLE_API_KEY ->
  GOOGLE_GENERATIVE_AI_API_KEY to match envOrSkip(...) in
  provider/google/generativeai/generativeai_test.go and the
  Vercel AI SDK convention; previously Google integration
  tests silently skipped in CI due to this mismatch
- .env.example: document the Google Gemini env vars using
  the same naming convention
- generativeai_test.go: bump integration default model from
  gemini-2.0-flash to gemini-2.5-flash (2.0-flash retires
  2026-06-01); leave Gemini 3.x rollout to a separate PR
  pending verification of functionResponse id requirement

Author: akazwz

.env.example

@@ -10,3 +10,10 @@ ANTHROPIC_MODEL=claude-sonnet-4-20250514
 ANTHROPIC_REASONING_MODEL=anthropic/claude-3.5-sonnet:thinking
 # Set to "bearer" when using proxies like OpenRouter (uses Authorization: Bearer instead of x-api-key)
 ANTHROPIC_AUTH_MODE=
+
+# Google Gemini (Generative Language API)
+# Get a key at https://aistudio.google.com/apikey
+# The long env name mirrors the Vercel AI SDK convention; keep it stable.
+GOOGLE_GENERATIVE_AI_API_KEY=AIzaxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+GOOGLE_GENERATIVE_AI_BASE_URL=https://generativelanguage.googleapis.com/v1beta
+GOOGLE_GENERATIVE_AI_MODEL=gemini-2.5-flash

.github/workflows/ci.yml

@@ -5,6 +5,7 @@ on:
     branches: [main]
   pull_request:
     branches: [main]
+  workflow_dispatch:
 
 permissions:
   contents: read
@@ -53,7 +54,9 @@ jobs:
     name: Integration Tests
     runs-on: ubuntu-latest
     needs: test
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    if: |
+      (github.event_name == 'push' && github.ref == 'refs/heads/main')
+      || github.event_name == 'workflow_dispatch'
 
     steps:
       - uses: actions/checkout@v4
@@ -70,5 +73,5 @@ jobs:
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
           ANTHROPIC_BASE_URL: ${{ secrets.ANTHROPIC_BASE_URL }}
           ANTHROPIC_MODEL: ${{ secrets.ANTHROPIC_MODEL }}
-          GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
+          GOOGLE_GENERATIVE_AI_API_KEY: ${{ secrets.GOOGLE_GENERATIVE_AI_API_KEY }}
         run: go test ./... -count=1 -v -run '^TestIntegration_|^TestClient_' -timeout 120s

provider/google/generativeai/generativeai_test.go

@@ -972,7 +972,7 @@ func integrationModel(t *testing.T) *sdk.Model {
 	t.Helper()
 	m := os.Getenv("GOOGLE_GENERATIVE_AI_MODEL")
 	if m == "" {
-		m = "gemini-2.0-flash"
+		m = "gemini-2.5-flash"
 	}
 	return &sdk.Model{ID: m}
 }