make dockerfile multiplatofrm

Dockerfile

@@ -1,10 +1,21 @@
-FROM golang:1.25.6-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.25.6-alpine AS builder
 WORKDIR /app
+
+RUN apk add --no-cache git ca-certificates tzdata
+
 COPY go.mod go.sum ./
 RUN go mod download
+
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo \
-    -ldflags="-w -s" -trimpath -o pm ./cmd/survey/
+
+ARG TARGETOS
+ARG TARGETARCH
+
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build \
+    -a -installsuffix cgo \
+    -ldflags="-w -s" \
+    -trimpath \
+    -o pm ./cmd/survey/
 
 FROM gcr.io/distroless/static-debian13
 WORKDIR /data

Makefile

@@ -17,8 +17,15 @@ build: tidy
 	go build -o ./bin/web ./cmd/web
 	go build -o ./bin/survey ./cmd/survey
 
-docker-build:
-	@docker build -t telikz/lazypm .
+enable-multiplatform-build:
+	@docker buildx create --name multiplatform --use 2>/dev/null || docker buildx use multiplatform
+
+docker-build: enable-multiplatform-build
+	@docker buildx build \
+  --platform linux/amd64,linux/arm64,linux/arm/v7 \
+  -t telikz/lazypm:latest \
+  --push .
+
 
 docker-run:
 	@docker run -it -p 8080:8080 -v "$PWD:/data" telikz/lazypm:latest start