Update version to 3.0.0 (New icon formats, dropped legacy URL)

build/Dockerfile

@@ -1,17 +1,14 @@
-FROM golang:1.21-alpine AS builder
+FROM golang:1.25-alpine AS builder
 
 WORKDIR /app
 
 COPY go.mod main.go ./
 
-RUN go mod tidy && \
-    go mod download && \
-    CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o server .
+RUN CGO_ENABLED=0 go build -o server .
 
 FROM scratch
 
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-
 COPY --from=builder /app/server /server
 
 USER 65534:65534