Add network egress resource (#357)

This change adds a new import resource which enables exposing Netbird
resources as Kubernetes services. This remove the need to add sidecars
to every pod.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added a new `NetworkEgress` custom resource (`netbird.io/v1alpha1`)
with CRD, schema validation, and status/conditions.
* Extended controller functionality to create egress services and
translate egress rules into import `EndpointSlice` resources; egress
pods now include a kube-egress-forwarder sidecar.
* **Bug Fixes**
* Added missing deep-copy and declarative apply support for the new
`NetworkEgress` API types.
* **Documentation**
* Updated README/API reference and added example manifests for
`NetworkEgress` (including IP/FQDN target usage).
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Philip Laine <philip.laine@gmail.com>

api/v1alpha1/zz_generated.deepcopy.go

@@ -313,6 +313,179 @@ func (in *GroupStatus) DeepCopy() *GroupStatus {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgress) DeepCopyInto(out *NetworkEgress) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
+	in.Spec.DeepCopyInto(&out.Spec)
+	in.Status.DeepCopyInto(&out.Status)
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgress.
+func (in *NetworkEgress) DeepCopy() *NetworkEgress {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgress)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *NetworkEgress) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgressFQDNTarget) DeepCopyInto(out *NetworkEgressFQDNTarget) {
+	*out = *in
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgressFQDNTarget.
+func (in *NetworkEgressFQDNTarget) DeepCopy() *NetworkEgressFQDNTarget {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgressFQDNTarget)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgressIPTarget) DeepCopyInto(out *NetworkEgressIPTarget) {
+	*out = *in
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgressIPTarget.
+func (in *NetworkEgressIPTarget) DeepCopy() *NetworkEgressIPTarget {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgressIPTarget)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgressList) DeepCopyInto(out *NetworkEgressList) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
+	if in.Items != nil {
+		in, out := &in.Items, &out.Items
+		*out = make([]NetworkEgress, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgressList.
+func (in *NetworkEgressList) DeepCopy() *NetworkEgressList {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgressList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *NetworkEgressList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgressPort) DeepCopyInto(out *NetworkEgressPort) {
+	*out = *in
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgressPort.
+func (in *NetworkEgressPort) DeepCopy() *NetworkEgressPort {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgressPort)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgressSpec) DeepCopyInto(out *NetworkEgressSpec) {
+	*out = *in
+	out.NetworkRouterRef = in.NetworkRouterRef
+	in.Target.DeepCopyInto(&out.Target)
+	if in.Ports != nil {
+		in, out := &in.Ports, &out.Ports
+		*out = make([]NetworkEgressPort, len(*in))
+		copy(*out, *in)
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgressSpec.
+func (in *NetworkEgressSpec) DeepCopy() *NetworkEgressSpec {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgressSpec)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgressStatus) DeepCopyInto(out *NetworkEgressStatus) {
+	*out = *in
+	if in.Conditions != nil {
+		in, out := &in.Conditions, &out.Conditions
+		*out = make([]v1.Condition, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgressStatus.
+func (in *NetworkEgressStatus) DeepCopy() *NetworkEgressStatus {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgressStatus)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NetworkEgressTarget) DeepCopyInto(out *NetworkEgressTarget) {
+	*out = *in
+	if in.IP != nil {
+		in, out := &in.IP, &out.IP
+		*out = new(NetworkEgressIPTarget)
+		**out = **in
+	}
+	if in.FQDN != nil {
+		in, out := &in.FQDN, &out.FQDN
+		*out = new(NetworkEgressFQDNTarget)
+		**out = **in
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NetworkEgressTarget.
+func (in *NetworkEgressTarget) DeepCopy() *NetworkEgressTarget {
+	if in == nil {
+		return nil
+	}
+	out := new(NetworkEgressTarget)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *NetworkResource) DeepCopyInto(out *NetworkResource) {
 	*out = *in