Initial import: KeepNote service (dcntrlized-auth consumer)

Dockerfile

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+# --- Build Stage ---
+FROM golang:1.26 AS builder
+WORKDIR /app
+
+# Shared modules (git.dcntrlized.org/dcntrlized/dcntrlized-auth) are served by
+# the dev Gitea Go module proxy. Override via --build-arg in production.
+ARG GOPROXY_VALUE=http://192.168.122.184:3000/api/packages/Dcntrlized/go
+ARG GONOSUMDB_VALUE=git.dcntrlized.org
+ENV GOPROXY=${GOPROXY_VALUE},https://proxy.golang.org,direct
+ENV GONOSUMDB=${GONOSUMDB_VALUE}
+
+COPY src/go.mod src/go.sum ./
+RUN go mod download
+
+COPY src/ ./
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o server main.go
+
+# --- Run Stage ---
+FROM alpine:latest
+WORKDIR /root/
+
+LABEL org.dcntrlized.service=KeepNote
+LABEL org.dcntrlized.port=8080
+
+COPY --from=builder /app/server .
+
+CMD ./server