ci: build amd64 on opt-in main commits [CI SKIP]

packaging/container/Agent.NativeBuild.Containerfile

@@ -0,0 +1,35 @@
+FROM mcr.microsoft.com/dotnet/sdk:10.0-noble-aot AS build
+
+WORKDIR /src/backend
+COPY restore/backend/ ./
+RUN dotnet restore agent/src/Monitor.Agent -r linux-x64 --artifacts-path /artifacts \
+    && dotnet restore fleet/tools/fleet-enroll -r linux-x64 --artifacts-path /artifacts
+
+COPY source/backend/ ./
+RUN dotnet publish agent/src/Monitor.Agent -m:3 -c Release -r linux-x64 \
+    --self-contained true --no-restore -p:PublishAot=true -p:UseAotAnywhere=false \
+    -p:UseAppHost=true -p:StripSymbols=true \
+    -p:DebugType=none -p:DebugSymbols=false --artifacts-path /artifacts -o /out/agent \
+    && dotnet publish fleet/tools/fleet-enroll -m:3 -c Release -r linux-x64 \
+    --self-contained true --no-restore -p:PublishAot=true -p:UseAotAnywhere=false \
+    -p:UseAppHost=true -p:StripSymbols=true \
+    -p:DebugType=none -p:DebugSymbols=false --artifacts-path /artifacts -o /out/enroll
+RUN test -x /out/agent/monitor-agent && test -x /out/enroll/fleet-enroll
+
+FROM mcr.microsoft.com/dotnet/runtime-deps:10.0-noble-chiseled-extra
+
+ARG APP_VERSION=main
+LABEL org.opencontainers.image.title="Monitor Agent" \
+      org.opencontainers.image.description="MyMonitor node agent for Linux" \
+      org.opencontainers.image.licenses="Apache-2.0" \
+      org.opencontainers.image.version="$APP_VERSION"
+
+COPY --chown=1654:1654 --from=build /out/agent/monitor-agent /usr/local/bin/monitor-agent
+COPY --chown=1654:1654 --from=build /out/enroll/fleet-enroll /usr/local/bin/fleet-enroll
+COPY --chown=1654:1654 config/ /etc/monitor/
+
+USER 1654:1654
+WORKDIR /etc/monitor
+VOLUME ["/etc/monitor"]
+ENTRYPOINT ["/usr/local/bin/monitor-agent"]
+CMD ["--config", "/etc/monitor/agent.json"]