Set default config to config directory to allow file system config mapping via directory

Dockerfile

@@ -1,13 +1,23 @@
-FROM golang:1.23.2 as builder
+FROM --platform=$BUILDPLATFORM golang:1.25 AS builder
-WORKDIR /build
+WORKDIR /src
+
 COPY go.mod go.sum ./
 RUN go mod download
-COPY cmd ./cmd
-COPY config ./config
-RUN CGO_ENABLED=0 GOOS=linux go build -o /app/cfdns ./cmd
 
+COPY cmd ./cmd
+COPY pkg ./pkg
+
+ARG TARGETOS
+ARG TARGETARCH
+ENV CGO_ENABLED=0
+
+# Build the binary for the requested OS/arch
+RUN GOOS=$TARGETOS GOARCH=$TARGETARCH \
+    go build -trimpath -ldflags="-s -w" -o /out/cfdns ./cmd
+
+# Minimal runtime
 FROM alpine:latest
 RUN apk --no-cache add ca-certificates
-COPY --from=builder /app/cfdns /app/cfdns
 WORKDIR /app
+COPY --from=builder /out/cfdns /app/cfdns
 ENTRYPOINT ["/app/cfdns"]

cmd/main.go

@@ -15,7 +15,7 @@ import (
 )
 
 const VERSION = "0.3.0"
-const DEFAULT_CONFIG_FILE = "cfdns.yaml"
+const DEFAULT_CONFIG_FILE = "config/cfdns.yaml"
 
 type CLIFlags struct {
 	ConfigFile string