Fix integration tests scheduled run and agent host (#453)

Author: zippolyte

.github/workflows/test_integration.yml

@@ -15,10 +15,12 @@ jobs:
   test_integration:
     runs-on: ubuntu-latest
     if: >
+      (github.event_name == 'pull_request' &&
       github.event.pull_request.draft == false &&
       !contains(github.event.pull_request.labels.*.name, 'ci/skip') &&
       !contains(github.event.pull_request.head.ref, 'datadog-api-spec/test/') &&
-      contains(github.event.pull_request.labels.*.name, 'ci/integrations')
+      contains(github.event.pull_request.labels.*.name, 'ci/integrations')) ||
+      github.event_name == 'schedule'
     services:
       datadog-agent:
         image: datadog/agent:latest
@@ -41,7 +43,7 @@ jobs:
       shell: bash
       env:
         CI: "true"
-        DD_AGENT_HOST: datadog-agent
+        DD_AGENT_HOST: localhost
         DD_ENV: prod
         DD_SERVICE: datadog-api-client-python
         DD_TAGS: "team:integration-tools-and-libraries"