fix: Hadolint issue DL3018 & 3045

.gitignore

@@ -1,2 +1,2 @@
-.vscode
 .task
+.vscode

Dockerfile

@@ -1,20 +1,30 @@
-FROM golang:1.23.3-alpine as builder
-
-RUN apk update && apk add --no-cache git ca-certificates tzdata && update-ca-certificates
-
-RUN mkdir /app
+FROM golang:1.23.3-alpine AS builder
+ENV CGO_ENABLED=0 \
+    GOARCH=amd64 \
+    GOOS=linux \
+    PROJECT_NAME=mcvs-integrationtest-services
 WORKDIR /app
-
-COPY go.mod go.sum ./
-
-RUN go mod download
 COPY . .
-
-ARG APPLICATION=mcvs-integrationtest-services
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -o main ./cmd/$APPLICATION
+RUN apk update && \
+    apk add \
+      --no-cache \
+        ca-certificates=~20240705-r0 \
+        git=~2 \
+        tzdata=~2024 && \
+    update-ca-certificates && \
+    go mod download && \
+    go build \
+      -a \
+      -installsuffix cgo \
+      -o main \
+      ./cmd/${PROJECT_NAME} && \
+    adduser -D -u 1000 ${PROJECT_NAME}
 
 FROM scratch
+COPY --from=builder /etc/passwd /etc/passwd
+COPY --from=builder /etc/group /etc/group
 COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-COPY --from=builder /app/main ./main
-CMD ["./main"]
+COPY --from=builder /app/main /app/main
+USER mcvs-integrationtest-services
+ENTRYPOINT ["/app/main"]