Docker setup and read yaml

Dockerfile

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+FROM golang:latest AS builder
+WORKDIR /app
+COPY code/go.mod code/go.sum ./
+RUN go mod download
+COPY code/main.go .
+RUN CGO_ENABLED=0 GOOS=linux go build -o server main.go
+
+FROM alpine:latest
+RUN apk add --no-cache \
+    gnucobol \
+    gcc \
+    musl-dev
+COPY api.yaml /api.yaml
+COPY src/ /src/
+COPY --from=builder /app/server /server
+EXPOSE 8080
+ENTRYPOINT ["/server"]