build: Refactor Dockerfile for multi-arch support and improved build …

…process

Dockerfile

@@ -1,31 +1,57 @@
-# build flutter-web stage
-FROM neosu/flutter-web:3.13.9 AS flutter-web-builder
+# syntax=docker/dockerfile:1.4
+
+##
+## 1) Build Flutter Web (amd64 seulement)
+##
+FROM --platform=linux/amd64 neosu/flutter-web:3.13.9 AS flutter-web-builder
 
-COPY ui /ui
 WORKDIR /ui
+COPY ui/ /ui/
 
 RUN flutter pub get
-RUN flutter build web --dart-define=BUILD_TYPE=prod --tree-shake-icons --pwa-strategy none --web-renderer html --release
+RUN flutter build web \
+    --dart-define=BUILD_TYPE=prod \
+    --tree-shake-icons \
+    --pwa-strategy none \
+    --web-renderer html \
+    --release
+
+##
+## 2) Build Golang (multi-arch)
+##
+FROM --platform=$BUILDPLATFORM golang:1.21.3 AS go-builder
 
-# build golang stage
-FROM golang:1.21.3 AS go-builder
+ARG TARGETOS
+ARG TARGETARCH
+
+ENV CGO_ENABLED=0 \
+    GOOS=$TARGETOS \
+    GOARCH=$TARGETARCH
 
 WORKDIR /app
-ENV CGO_ENABLED=0 GOOS=linux GOARCH=amd64
-ADD go.mod .
-ADD go.sum .
+
+# On copie d'abord les go.mod / go.sum
+COPY go.mod go.sum ./
 RUN go mod download
 
+# Copie du reste du code
 COPY . .
+
+# On copie les fichiers web compilés par Flutter
 COPY --from=flutter-web-builder /ui/build/web /app/web
+
+# Compilation Go
 RUN go build -a -ldflags="-w -s" -o /app/cmd/kubebadges/main ./cmd/kubebadges
 
-# production stage
-FROM alpine:latest
+##
+## 3) Image finale (multi-arch)
+##
+FROM --platform=$TARGETPLATFORM alpine:latest
+
 WORKDIR /app
 COPY --from=go-builder /app/cmd/kubebadges/main /app/main
 RUN chmod +x /app/main
 
 EXPOSE 8080 8090
 
-CMD ["/app/main"]
+CMD ["/app/main"]