Deterministically order pod inspect fields

There are two fields I'm worried about: shared namespaces and pod
containers. Both are generated via loops over maps and are thus
non-deterministic in ordering. Throw a sort on each to fix the
order so we can actually diff `podman pod inspect` output.

Signed-off-by: Matt Heon <mheon@redhat.com>

libpod/pod_api.go

@@ -6,6 +6,9 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"slices"
+	"sort"
+	"strings"
 
 	"github.com/containers/podman/v6/libpod/define"
 	"github.com/containers/podman/v6/libpod/events"
@@ -620,6 +623,8 @@ func (p *Pod) Inspect() (*define.InspectPodData, error) {
 			ctrStatuses[c.ID()] = c.state.State
 		}
 	}
+	slices.SortFunc(ctrs, func(a, b define.InspectPodContainerInfo) int { return strings.Compare(a.ID, b.ID) })
+
 	podState, err := createPodStatusResults(ctrStatuses)
 	if err != nil {
 		return nil, err
@@ -641,6 +646,7 @@ func (p *Pod) Inspect() (*define.InspectPodData, error) {
 			sharesNS = append(sharesNS, nsStr)
 		}
 	}
+	sort.Strings(sharesNS)
 
 	// Infra config contains detailed information on the pod's infra
 	// container.

test/system/200-pod.bats

@@ -807,4 +807,12 @@ function thingy_with_unique_id() {
     done
 }
 
+@test "podman pod inspect ordering" {
+    local pod_name="p-$(safename)"
+    run_podman pod create $pod_name
+
+    run_podman pod inspect --format '{{ .SharedNamespaces }}' $pod_name
+    assert "$output" == "[ipc net uts]"
+}
+
 # vim: filetype=sh