make deployment container-ready

Dockerfile

@@ -0,0 +1,10 @@
+FROM golang:alpine AS builder
+WORKDIR /build
+ADD go.mod .
+COPY . .
+RUN go build 
+FROM alpine
+WORKDIR /build
+COPY --from=builder /build/wo-bisch-lorahandler /build/wo-bisch-lorahandler
+CMD ["./wo-bisch-lorahandler"]
+EXPOSE 8080

persistence.go

@@ -4,6 +4,7 @@ import (
 	"github.com/gomodule/redigo/redis"
 	"log"
 	"time"
+	"os"
 )
 
 var globalPool *redis.Pool
@@ -11,6 +12,14 @@ var globalPool *redis.Pool
 const alertsentPrefix string = "alertsent:"
 const devPrefix string = "dev:"
 
+func getenv(key, fallback string) string {
+    value := os.Getenv(key)
+    if len(value) == 0 {
+        return fallback
+    }
+    return value
+}
+
 func newPool() *redis.Pool {
 	return &redis.Pool{
 		// Maximum number of idle connections in the pool.
@@ -20,7 +29,7 @@ func newPool() *redis.Pool {
 		// Dial is an application supplied function for creating and
 		// configuring a connection.
 		Dial: func() (redis.Conn, error) {
-			c, err := redis.Dial("tcp", ":6379")
+			c, err := redis.Dial("tcp", getenv("REDIS_CONNECTION_STRING",":6379"))
 			if err != nil {
 				panic(err.Error())
 			}

wo-bisch-lorahandler.go

@@ -17,7 +17,7 @@ import (
 )
 
 const (
-	outputfile = "/home/appuser/wo-bisch-lorahandler/wo-bisch-lorahandler.log"
+	outputfile = "/data/wo-bisch-lorahandler.log"
 )
 
 type MessageProperties struct {