Create go backend for site SSR and Dockerfile for dockerization

Dockerfile

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+FROM golang:1.26-alpine AS base
+
+WORKDIR /build
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY *.go .
+
+RUN go build -o calic0site
+
+EXPOSE 8080
+
+COPY config /config
+
+CMD ["/build/calic0site", "-config=/config", "-content=/content", "-debug"]