First attempt at creating dockerfile

docker/Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.23-bookworm AS base
+
+# /build is the working directory
+WORKDIR /build
+
+# Copy control files and pull in dependencies
+COPY go.mod .
+RUN go mod download
+
+ENV port=8089
+# Copy the rest of the source code into the container
+COPY code/* .
+
+# Build the app
+
+RUN go build -o fibonacci
+
+EXPOSE ${port}
+
+CMD ["build/fibonacci"]