Merge pull request #2392 from souleb/issue-2387

cmd/flux/diff_kustomization_test.go

cmd/flux/main.go

cmd/flux/testdata/build-kustomization/podinfo-result.yaml

...d-kustomization/podinfo/dockerconfigjson-sops-secret.yaml

...x/testdata/build-kustomization/podinfo/kustomization.yaml

...stdata/build-kustomization/podinfo/stringdata-secret.yaml

...x/testdata/diff-kustomization/diff-with-deployment.golden

...stomization/diff-with-dockerconfigjson-sops-secret.golden

...ff-kustomization/diff-with-drifted-key-sops-secret.golden

...stdata/diff-kustomization/diff-with-drifted-secret.golden

...tdata/diff-kustomization/diff-with-drifted-service.golden

...-kustomization/diff-with-drifted-value-sops-secret.golden

...iff-kustomization/diff-with-stringdata-sops-secret.golden

...data/diff-kustomization/dockerconfigjson-sops-secret.yaml

...ux/testdata/diff-kustomization/nothing-is-deployed.golden

...x/testdata/diff-kustomization/stringdata-sops-secret.yaml

internal/build/build.go

internal/build/build_test.go

internal/build/diff.go