fix: hash scheduler-k3s cron-id label to fit Kubernetes' 63-byte cap

The `dokku.com/cron-id` label could exceed Kubernetes' 63-byte cap because the cron ID is `base36(appName === command === schedule)`, which expands roughly 1.5x per byte. The label is now keyed `dokku.com/cron-hash` and holds the `sha1` hex digest of the cron-id, a fixed 40-character value that always fits the cap. The same hex digest is mirrored into the `dokku.com/cron-hash` annotation, and the original base36 cron-id stays in the `dokku.com/cron-id` annotation that `cron:list` reads when surfacing user-facing IDs. Per-task lookups stay server-side via label selectors, so `cron:set --maintenance` and the forbid/replace concurrency checks on `dokku run --cron-id` keep working without any in-memory filtering.

tests/apps/python/app-cnb-cron.json

@@ -1,7 +1,7 @@
 {
   "cron": [
     {
-      "command": "python3 task.py",
+      "command": "python3 task.py some cron task",
       "schedule": "5 5 5 5 5"
     }
   ],

tests/unit/builder-pack.bats

@@ -265,7 +265,7 @@ teardown() {
   echo "output: $output"
   echo "status: $status"
   assert_success
-  assert_output "['task.py']"
+  assert_output "['task.py', 'some', 'cron', 'task']"
 }
 
 @test "(builder-pack) cron:run with Procfile reference" {

tests/unit/scheduler-k3s-cnb.bats

@@ -103,11 +103,31 @@ teardown() {
   assert_success
   assert_output_exists
 
+  cron_hash="$(printf '%s' "$cron_id" | sha1sum | awk '{print $1}')"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.annotations.\"dokku.com/cron-id\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_id"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.labels.\"dokku.com/cron-hash\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_hash"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.annotations.\"dokku.com/cron-hash\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_hash"
+
   run /bin/bash -c "dokku --quiet cron:run $TEST_APP $cron_id"
   echo "output: $output"
   echo "status: $status"
   assert_success
-  assert_output_contains "['task.py']"
+  assert_output_contains "['task.py', 'some', 'cron', 'task']"
 }
 
 @test "(scheduler-k3s) cnb dokku run uses launcher entrypoint" {

tests/unit/scheduler-k3s-dockerfile.bats

@@ -94,6 +94,26 @@ teardown() {
   assert_success
   assert_output_exists
 
+  cron_hash="$(printf '%s' "$cron_id" | sha1sum | awk '{print $1}')"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.annotations.\"dokku.com/cron-id\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_id"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.labels.\"dokku.com/cron-hash\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_hash"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.annotations.\"dokku.com/cron-hash\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_hash"
+
   run /bin/bash -c "dokku --quiet cron:run $TEST_APP $cron_id"
   echo "output: $output"
   echo "status: $status"

tests/unit/scheduler-k3s-herokuish.bats

@@ -99,6 +99,26 @@ teardown() {
   assert_success
   assert_output_exists
 
+  cron_hash="$(printf '%s' "$cron_id" | sha1sum | awk '{print $1}')"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.annotations.\"dokku.com/cron-id\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_id"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.labels.\"dokku.com/cron-hash\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_hash"
+
+  run /bin/bash -c "kubectl get cronjob -o json | jq -r '.items[0].metadata.annotations.\"dokku.com/cron-hash\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "$cron_hash"
+
   run /bin/bash -c "dokku --quiet cron:run $TEST_APP $cron_id"
   echo "output: $output"
   echo "status: $status"