Initial commit

Dockerfile

@@ -0,0 +1,17 @@
+FROM golang:1.25-alpine AS builder
+
+ARG CHECKER_VERSION=custom-build
+
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -tags standalone -ldflags "-X main.Version=${CHECKER_VERSION}" -o /checker-smtp .
+
+FROM scratch
+COPY --from=builder /checker-smtp /checker-smtp
+USER 65534:65534
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD ["/checker-smtp", "-healthcheck"]
+ENTRYPOINT ["/checker-smtp"]