fix: scheduler container supervises scheduler instead of dag-processor

[sweb]

Description

With Airflow 3, the dag processor was supervised instead of the scheduler in the scheduler container. When the scheduler process died, the pod would not terminate and continue to declare itself as healthy even though nothing would get scheduled.

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
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Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Helm chart can be installed and deployed operator works
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible
• Links to generated (nightly) docs added
• Release note snippet added

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
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• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
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• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
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[razvan]

lgtm, assuming the kuttl tests work. didn't run them

[sweb]

lgtm, assuming the kuttl tests work. didn't run them

=== NAME  kuttl
    harness.go:406: run tests finished
    harness.go:514: cleaning up
    harness.go:571: removing temp folder: ""
--- PASS: kuttl (4530.10s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/ca-cert_airflow-latest-3.2.2_openshift-false (360.55s)
        --- PASS: kuttl/harness/mount-dags-configmap_airflow-latest-3.2.2_openshift-false_executor-kubernetes (398.98s)
        --- PASS: kuttl/harness/mount-dags-configmap_airflow-latest-3.2.2_openshift-false_executor-celery (245.46s)
        --- PASS: kuttl/harness/versioning_airflow-latest-3.2.2_openshift-false (470.24s)
        --- PASS: kuttl/harness/ldap_airflow-latest-3.2.2_ldap-authentication-server-verification-tls_openshift-false_executor-kubernetes (329.35s)
        --- PASS: kuttl/harness/ldap_airflow-latest-3.2.2_ldap-authentication-server-verification-tls_openshift-false_executor-celery (254.23s)
        --- PASS: kuttl/harness/ldap_airflow-latest-3.2.2_ldap-authentication-no-tls_openshift-false_executor-kubernetes (347.24s)
        --- PASS: kuttl/harness/ldap_airflow-latest-3.2.2_ldap-authentication-no-tls_openshift-false_executor-celery (261.54s)
        --- PASS: kuttl/harness/ldap_airflow-latest-3.2.2_ldap-authentication-insecure-tls_openshift-false_executor-celery (249.98s)
        --- PASS: kuttl/harness/ldap_airflow-latest-3.2.2_ldap-authentication-insecure-tls_openshift-false_executor-kubernetes (339.01s)
        --- PASS: kuttl/harness/overrides_airflow-latest-3.2.2_openshift-false (200.81s)
        --- PASS: kuttl/harness/remote-logging_airflow-latest-3.2.2_openshift-false_executor-kubernetes (351.18s)
        --- PASS: kuttl/harness/opa-interop_airflow-latest-3.2.2_opa-latest-1.16.2_openshift-false (175.59s)
        --- PASS: kuttl/harness/cluster-operation_airflow-latest-3.2.2_openshift-false (267.46s)
        --- PASS: kuttl/harness/external-access_airflow-3.2.2_openshift-false_executor-kubernetes (175.73s)
        --- PASS: kuttl/harness/opa_airflow-3.2.2_opa-latest-1.16.2_openshift-false (221.92s)
        --- PASS: kuttl/harness/external-access_airflow-3.2.2_openshift-false_executor-celery (165.71s)
        --- PASS: kuttl/harness/logging_airflow-3.2.2_openshift-false_executor-celery (279.56s)
        --- PASS: kuttl/harness/remote-logging_airflow-latest-3.2.2_openshift-false_executor-celery (256.03s)
        --- PASS: kuttl/harness/resources_airflow-latest-3.2.2_openshift-false (166.30s)
        --- PASS: kuttl/harness/mount-dags-gitsync_airflow-latest-3.2.2_openshift-false_executor-kubernetes_access-ssh (323.15s)
        --- PASS: kuttl/harness/logging_airflow-3.2.2_openshift-false_executor-kubernetes (616.35s)
        --- PASS: kuttl/harness/orphaned-resources_airflow-latest-3.2.2_openshift-false (329.39s)
        --- PASS: kuttl/harness/triggerer_airflow-latest-3.2.2_openshift-false_executor-kubernetes (247.49s)
        --- PASS: kuttl/harness/triggerer_airflow-latest-3.2.2_openshift-false_executor-celery (237.18s)
        --- PASS: kuttl/harness/mount-dags-gitsync_airflow-latest-3.2.2_openshift-false_executor-celery_access-ssh (353.88s)
        --- PASS: kuttl/harness/mount-dags-gitsync_airflow-latest-3.2.2_openshift-false_executor-kubernetes_access-https (300.72s)
        --- PASS: kuttl/harness/smoke_airflow-3.2.2_openshift-false_executor-celery (345.43s)
        --- PASS: kuttl/harness/smoke_airflow-3.2.2_openshift-false_executor-kubernetes (319.49s)
        --- PASS: kuttl/harness/mount-dags-gitsync_airflow-latest-3.2.2_openshift-false_executor-celery_access-https (234.90s)
        --- PASS: kuttl/harness/oidc_airflow-latest-3.2.2_openshift-false (228.85s)
PASS
2026-08-21 10:54:28 :: Test exited with code 0
2026-08-21 10:54:28 :: 
2026-08-21 10:54:28 :: Waiting 1 minute to allow logs to be processed...
2026-08-21 10:55:28 :: Terminating a cluster named 'ba0b2151ef4442c782f15d4898cb3fa9' on replicated.com...
Archiving artifacts
[description-setter] Description set: k3s on replicated.com (1.36.2)
[Slack Notifications] found #111 as previous completed, non-aborted build
[Slack Notifications] will send OnBackToNormalNotification because build matches and user preferences allow it
Finished: SUCCESS