Merge bitcoin/bitcoin#26856: ci: Run one task with all tests on credits

fae885b98f ci: Run one task with all tests on credits (MarcoFalke)

Pull request description:

  This should allow to detect any obvious issues in the tests within 10 minutes of opening a pull request, regardless of the current scheduling load on the Cirrus CI community cluster.

ACKs for top commit:
  fanquake:
    ACK fae885b98f

Tree-SHA512: 384651364648cd38a126f64a5cc650dd396735c05f7d8b5d5c9a8ee7b3b98e36f5dfb3b1c0563ba4d9f554b5e0e82e13aa38e78092f11856a82fc76270fe6f3e

.cirrus.yml

@@ -213,6 +213,8 @@ task:
   << : *GLOBAL_TASK_TEMPLATE
   container:
     image: quay.io/centos/centos:stream8
+  # For faster CI feedback, immediately schedule one task that runs all tests
+  << : *CREDITS_TEMPLATE
   env:
     << : *CIRRUS_EPHEMERAL_WORKER_TEMPLATE_ENV
     PACKAGE_MANAGER_INSTALL: "yum install -y"