Split containerfile, move to container folder

Signed-off-by: Asai Neko <sugar@sne.moe>

container/backend.Containerfile

@@ -0,0 +1,11 @@
+FROM docker.io/golang:1.25.5-alpine AS backend-build
+WORKDIR /app
+COPY . /app
+RUN go mod tidy && \
+    go build -o /app/nixcn-cms
+
+FROM docker.io/alpine:3.23
+WORKDIR /app
+COPY --from=backend-build /app/nixcn-cms /app/nixcn-cms
+EXPOSE 8000
+ENTRYPOINT [ "/app/nixcn-cms" ]

container/client-cms.Containerfile

@@ -7,20 +7,8 @@ ENV VITE_APP_BASE_URL=$CLIENT_BASE_URL
 COPY . .
 RUN just build-client-cms
 
-FROM docker.io/busybox:1.37 AS client-cms
+FROM docker.io/busybox:1.37
 WORKDIR /app
 COPY --from=client-build /app/.outputs/client/cms/dist .
 EXPOSE 3000
 ENTRYPOINT ["httpd", "-f", "-p", "3000", "-h", "/app", "-v"]
-
-FROM docker.io/golang:1.25.5-alpine AS backend-build
-WORKDIR /app
-COPY . /app
-RUN go mod tidy && \
-    go build -o /app/nixcn-cms
-
-FROM docker.io/alpine:3.23 AS backend
-WORKDIR /app
-COPY --from=backend-build /app/nixcn-cms /app/nixcn-cms
-EXPOSE 8000
-ENTRYPOINT [ "/app/nixcn-cms" ]