ci: add docker images, update docs

Dockerfile

@@ -0,0 +1,27 @@
+FROM golang:1.22.3-bookworm as build
+
+ENV CGO_ENABLED=1
+
+ARG BUILDPLATFORM
+ARG TARGETPLATFORM
+ARG BUILD=dev
+
+RUN echo "Building on $BUILDPLATFORM, building for $TARGETPLATFORM"
+WORKDIR /build
+
+COPY . .
+RUN go mod download
+RUN go build -o celo-tracker -ldflags="-X main.build=${BUILD} -s -w" cmd/*
+
+FROM debian:bookworm-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+WORKDIR /service
+
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=build /build/* .
+
+EXPOSE 5001
+
+CMD ["./celo-tracker"]