Add build scripts and dockerfile

Dockerfile

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+# ---- Base ----
+FROM alpine:3 AS base
+WORKDIR /app
+
+
+# ---- Build ----
+FROM golang:1.19-alpine AS build
+WORKDIR /build
+# Copy sources
+ADD . .
+# Get dependencies
+RUN go get ./cmd/app
+# Compile
+RUN CGO_ENABLED=0 go build -a -o app ./cmd/app
+
+
+# ---- Release ----
+FROM base AS release
+# Copy build-target
+COPY --from=build /build/app .
+
+CMD ["./app"]  

build/docker-multiarch.sh

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+TAG="ruakij/routingtabletowg"
+PLATFORM="linux/amd64,linux/arm64/v8,linux/arm/v7"
+EXTRA_ARGS="$@"
+
+docker buildx build \
+--platform $PLATFORM \
+--tag $TAG \
+$EXTRA_ARGS
+.

build/docker-ownarch.sh

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+TAG="ruakij/routingtabletowg"
+EXTRA_ARGS="$@"
+
+docker build \
+--tag $TAG \
+$EXTRA_ARGS \
+.