feat: allow public port specified in CLI flag

Specify a custom port for listening with a default of 8080.

chart/templates/deployment.yaml

@@ -33,10 +33,11 @@ spec:
             {{- toYaml .Values.securityContext | nindent 12 }}
           image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
           imagePullPolicy: {{ .Values.image.pullPolicy }}
-          {{- if .Values.verbose }}
           args:
-            - -verbose
-          {{- end }}
+            - "-port {{ .Values.service.public.port }}"
+            {{- if .Values.verbose }}
+            - "-verbose"
+            {{- end }}
           ports:
             - name: internal
               containerPort: {{ .Values.service.internal.port }}

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"flag"
+	"fmt"
 	"net/http"
 	"strconv"
 	"time"
@@ -113,6 +114,7 @@ func setHeartRateSeconds(w http.ResponseWriter, r *http.Request) {
 
 func main() {
 	verbose := flag.Bool("verbose", false, "show debug messages")
+	listenPort := flag.Int("port", 8080, "listen port for server")
 	flag.Parse()
 
 	log.SetFormatter(&log.JSONFormatter{})
@@ -138,5 +140,5 @@ func main() {
 		http.ListenAndServe(":9090", internalMux)
 	}()
 	log.Info("Listening for heartbeat changes.")
-	http.ListenAndServe(":8080", mainMux)
+	http.ListenAndServe(fmt.Sprintf(":%d", *listenPort), mainMux)
 }