ADD docker specs

Dockerfile

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+
+FROM golang:alpine AS builder
+ARG TARGETPLATFORM=no-set
+ARG version=not-set
+ARG SHORTSHA=not-set
+WORKDIR /app
+COPY . .
+# https://stackoverflow.com/questions/70369368/check-architecture-in-dockerfile-to-get-amd-arm
+RUN go build -o bin/ddns \
+    -ldflags "-X main.Shortsha=${SHORTSHA} \
+    -X main.Version=${version} \
+    -X main.Aarch=${TARGETPLATFORM}" ./cmd
+
+FROM alpine AS runner
+COPY --from=builder /app/bin/ddns /usr/bin/
+ENTRYPOINT /usr/bin/ddns

compose.yaml

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+services:
+  ddns:
+    image: ddns
+    env_file: ".env"