feat: allow exposing non-web processes as kubernetes services

Closes #7204

tests/unit/scheduler-k3s-4.bats

@@ -0,0 +1,70 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+TEST_APP="rdmtestapp"
+
+setup() {
+  uninstall_k3s || true
+  global_setup
+  dokku nginx:stop
+  export KUBECONFIG="/etc/rancher/k3s/k3s.yaml"
+}
+
+teardown() {
+  global_teardown
+  dokku nginx:start
+  uninstall_k3s || true
+}
+
+@test "(scheduler-k3s) app.json defined service" {
+  if [[ -z "$DOCKERHUB_USERNAME" ]] || [[ -z "$DOCKERHUB_TOKEN" ]]; then
+    skip "skipping due to missing docker.io credentials DOCKERHUB_USERNAME:DOCKERHUB_TOKEN"
+  fi
+
+  INGRESS_CLASS=nginx install_k3s
+
+  run /bin/bash -c "dokku apps:create $TEST_APP"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku ps:scale $TEST_APP web=1 worker=1"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run deploy_app python dokku@$DOKKU_DOMAIN:$TEST_APP inject_app_json
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "kubectl get services $TEST_APP-web -o json | jq -r '.spec.ports[0].port'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "80"
+
+  run /bin/bash -c "kubectl get services $TEST_APP-web -o json | jq -r '.spec.ports[0].targetPort'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "5000"
+}
+
+inject_app_json() {
+  local APP="$1"
+  local APP_REPO_DIR="$2"
+  [[ -z "$APP" ]] && local APP="$TEST_APP"
+  cat <<EOF >"$APP_REPO_DIR/app.json"
+{
+  "formation": {
+    "worker": {
+      "service": {
+        "exposed": true
+      }
+    }
+  }
+}
+EOF
+}