feat: initial commit — uptime monitor (forked from go-upkeep)

Go-based uptime monitor with SQLite/Postgres storage, TUI dashboard,
SSH server, alerting, and clustering support.

Dockerfile

@@ -0,0 +1,28 @@
+# --- Stage 1: Builder ---
+FROM golang:alpine AS builder
+RUN apk add --no-cache gcc musl-dev
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+ENV CGO_ENABLED=1
+RUN go build -ldflags="-s -w" -o go-upkeep ./cmd/goupkeep/main.go
+
+# --- Stage 2: Runner ---
+FROM alpine:latest
+WORKDIR /app
+RUN apk add --no-cache ca-certificates openssh-client
+RUN mkdir /data
+
+COPY --from=builder /app/go-upkeep .
+
+# Set Default Configuration via ENV
+# Docker users can override these in docker-compose.yml
+ENV LIPGLOSS_RENDERER_HAS_DARK_BACKGROUND=true
+ENV UPKEEP_DB_TYPE=sqlite
+ENV UPKEEP_DB_DSN=/data/upkeep.db
+ENV UPKEEP_KEYS=/data/authorized_keys
+ENV UPKEEP_PORT=23234
+
+EXPOSE 23234
+CMD ["./go-upkeep"]