Add dockerfile, compose-file + github workflow

.github/workflows/build.yml

@@ -18,3 +18,24 @@ jobs:
 
       - name: Build
         run: go build
+
+
+  docker:
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build Docker image
+        run: docker build -t ghcr.io/${{ github.repository }}:latest .
+
+      - name: Push Docker image
+        run: docker push ghcr.io/${{ github.repository }}:latest

Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:1.21-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . .
+
+RUN go build -o weather-exporter .
+
+
+
+FROM alpine:latest
+RUN addgroup -S app && adduser -S app -G app
+WORKDIR /app
+
+COPY --from=builder /app/weather-exporter .
+
+EXPOSE 8080
+USER app
+CMD ["./weather-exporter"]

docker-compose.yml

@@ -0,0 +1,26 @@
+version: '3.8'
+
+services:
+  weather-exporter:
+    build: .
+    environment:
+      - WEATHER_EXPORTER_WEBSERVERPORT=8082
+      - WEATHER_EXPORTER_LOGLEVEL=info
+      - WEATHER_EXPORTER_JSONEXPORTER_ENABLED=true
+      - WEATHER_EXPORTER_PROMETHEUSEXPORTER_ENABLED=true
+      - WEATHER_EXPORTER_INFLUXDBEXPORTER_ENABLED=false
+      - WEATHER_EXPORTER_INFLUXDBEXPORTER_SERVER=1.2.3.4
+      - WEATHER_EXPORTER_INFLUXDBEXPORTER_PORT=8086
+      - WEATHER_EXPORTER_INFLUXDBEXPORTER_ORG=<org>
+      - WEATHER_EXPORTER_INFLUXDBEXPORTER_TOKEN=<token> # or <username>:<password>
+      - WEATHER_EXPORTER_INFLUXDBEXPORTER_DATABASE=<database(bucket)>
+      - WEATHER_EXPORTER_INFLUXDBEXPORTER_MEASUREMENT=<measurement>
+      - WEATHER_EXPORTER_MQTT_ENABLED=false
+      - WEATHER_EXPORTER_MQTT_BROKERADDRESS=1.2.3.4
+      - WEATHER_EXPORTER_MQTT_BROKERPORT=1883
+      - WEATHER_EXPORTER_MQTT_USERNAME=username
+      - WEATHER_EXPORTER_MQTT_PASSWORD=password
+      - WEATHER_EXPORTER_MQTT_CLIENTID=weather-exporter
+      - WEATHER_EXPORTER_MQTT_TOPICPREFIX=weather
+    ports:
+      - "8080:8080"

server.go

@@ -12,6 +12,7 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"strings"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -45,14 +46,18 @@ func loadConfig() {
 	viper.SetConfigName("config")
 	viper.AddConfigPath(configPath)
 
+	viper.AutomaticEnv()
+	viper.SetEnvPrefix("weather_exporter")
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+
 	viper.SetDefault("webserverPort", 8080)
 	viper.SetDefault("loglevel", "info")
 	viper.SetDefault("jsonExporter", map[string]interface{}{"enabled": true})
 	viper.SetDefault("prometheusExporter", map[string]interface{}{"enabled": true})
 	viper.SetDefault("influxDbExporter", map[string]interface{}{"enabled": false})
 
 	if err := viper.ReadInConfig(); err != nil {
-		log.Warnf("Error reading config file, using default values. %s", err)
+		log.Infof("Unable to read config file, using default values or environment. %s", err)
 	}
 	err := viper.Unmarshal(&config)
 	if err != nil {