Add deployment and improve Dockerfiles and CICD

backend/Dockerfile

@@ -1,18 +1,31 @@
-FROM golang:1.21.6
+# build stage
+FROM golang:alpine AS build
 
-# Set the Current Working Directory inside the container
 WORKDIR /app
 
-# Copy go mod and sum files
-COPY go.mod go.sum ./
-RUN go mod download
-
 # Copy the source from the current directory to the Working Directory inside the container
-COPY *.go ./
-COPY . .
+COPY . ./
+# download needed modules
+RUN apk add --no-cache --update go gcc g++ && \
+    go mod download && \
+    CGO_ENABLED=1 GOOS=linux go build -o /htwkalender
 
-# Build the Go app
-RUN CGO_ENABLED=1 GOOS=linux go build -o /htwkalender
+# production stage
+FROM alpine:latest AS prod
 
-# Expose port 8080 to the outside world
-EXPOSE 8080
+WORKDIR /htwkalender
+
+ARG USER=ical
+RUN adduser -Ds /bin/sh $USER && \
+    chown $USER:$USER ./
+
+USER $USER
+RUN mkdir -p data
+
+# copies executable from build container
+COPY --chown=$USER:$USER --from=build /htwkalender ./
+
+# Expose port 8090 to the outside world
+EXPOSE 8090
+
+ENTRYPOINT ["./htwkalender", "serve"]

backend/go.mod

@@ -1,6 +1,6 @@
 module htwkalender
 
-go 1.21
+go 1.21.6
 
 require (
 	github.com/PuerkitoBio/goquery v1.8.1

backend/service/date/dateFormat.go

@@ -1,14 +1,22 @@
 package date
 
 import (
+	"log/slog"
 	"strconv"
 	"strings"
 	"time"
+	_ "time/tzdata"
 )
 
 func GetDateFromWeekNumber(year int, weekNumber int, dayName string) (time.Time, error) {
 	// Create a time.Date for the first day of the year
-	europeTime, _ := time.LoadLocation("Europe/Berlin")
+	europeTime, err := time.LoadLocation("Europe/Berlin")
+
+	if err != nil {
+		slog.Error("Failed to load location: ", err)
+		return time.Time{}, err
+	}
+
 	firstDayOfYear := time.Date(year, time.January, 1, 0, 0, 0, 0, europeTime)
 
 	// Calculate the number of days to add to reach the desired week

backend/service/date/dateFormat_test.go

@@ -4,6 +4,7 @@ import (
 	"reflect"
 	"testing"
 	"time"
+	_ "time/tzdata"
 )
 
 func Test_getDateFromWeekNumber(t *testing.T) {

backend/service/ical/icalFileGeneration.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/jordic/goics"
+	_ "time/tzdata"
 )
 
 // IcalModel local type for EmitICal function