CI/CD - build docker container

Dockerfile

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+FROM golang:1.26-bookworm AS base
+
+# Move to working directory /app
+WORKDIR /app
+
+# Copy the go.mod and go.sum files to the /app directory
+COPY go.mod go.sum ./
+
+# Install dependencies
+RUN go mod download
+
+# Copy the entire source code into the container
+COPY . .
+
+# Build the application
+RUN go build -o shortener
+
+FROM golang:1.26-bookworm AS runner
+
+COPY --from=base /app/shortener /app/shortener
+
+# Document the port that may need to be published
+EXPOSE 8000
+
+# Start the application
+CMD ["/app/shortener"]