Add systemd units to artifact

Signed-off-by: Kevin Fox <Kevin.Fox@pnnl.gov>

Author: kfox1111

.goreleaser.yaml

@@ -28,6 +28,8 @@ archives:
       {{- else if eq .Arch "386" }}i386
       {{- else }}{{ .Arch }}{{ end }}
       {{- if .Arm }}v{{ .Arm }}{{ end }}
+    files:
+      - systemd/*
     # use zip for windows archives
     format_overrides:
       - goos: windows