add reconciliation build workflow

reconciliation.Dockerfile

@@ -0,0 +1,24 @@
+FROM golang:1.20-alpine as builder
+
+# 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 . .
+
+# Build the application
+WORKDIR /build/reconciliation_lost_invoices
+RUN go build -o main
+
+# Start a new, final image to reduce size.
+FROM alpine as final
+
+# Copy the binaries and entrypoint from the builder image.
+COPY --from=builder /build/reconciliation_lost_invoices/main /bin/
+
+ENTRYPOINT [ "/bin/main" ]