added building docker container

Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:1.24.5-alpine AS build-stage
+
+WORKDIR /app
+
+COPY . .
+
+RUN apk update && \
+    apk upgrade && \
+    apk add binutils && \
+    go mod tidy && \
+    go build && \
+    strip scm
+FROM alpine:latest AS build-release-stage
+
+WORKDIR /data
+
+COPY --from=build-stage /app/scm /scm
+RUN mkdir -p /certs
+COPY scm.conf.docker /data/scm.conf
+
+ENTRYPOINT [ "/scm" ]