Add Dockerfile and docker-compose.yml

This provides a Dockerfile with an docker-compose.yml to install ifconfig.io on a Docker Server

Dockerfile

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+FROM golang:alpine AS builder
+
+# Set necessary environmet variables needed for our image
+ENV GO111MODULE=on \
+    CGO_ENABLED=0 \
+    GOOS=linux \
+    GOARCH=amd64
+
+# Move to working directory /build
+WORKDIR /build
+
+# Copy and download dependency using go mod
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+# Copy the code into the container
+COPY main.go .
+
+# Build the application
+RUN go build -o main .
+
+# Move to /dist directory as the place for resulting binary folder
+WORKDIR /dist
+
+# Copy binary from build to main folder
+RUN cp /build/main .
+
+# Build a small image
+FROM scratch AS production
+
+COPY --from=builder /dist/main /
+COPY ./templates /templates
+COPY ./LICENSE /LICENSE
+
+# Command to run
+ENTRYPOINT ["/main"]
+