add docker build

.dockerignore

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+# Exclude "build-time" ignore files.
+.dockerignore
+
+# Exclude git history and configuration.
+.gitignore
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+out/

Dockerfile

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+FROM golang:1.21-bookworm as builder
+
+WORKDIR /app
+
+# Retrieve application dependencies.
+# This allows the container build to reuse cached dependencies.
+# Expecting to copy go.mod and if present go.sum.
+COPY go.* ./
+RUN go mod download
+
+ENV APP_ENV production
+
+# Copy local code to the container image.
+COPY . ./
+
+# Build the binary.
+RUN go build -v -o server
+
+# Use the official Debian slim image for a lean production container.
+# https://hub.docker.com/_/debian
+# https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds
+FROM debian:bookworm-slim
+RUN set -x && apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    ca-certificates && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy the binary to the production image from the builder stage.
+COPY --from=builder /app/server /app/server
+
+# Run the web service on container startup.
+CMD ["/app/server"]