Pin Docker image ...icrosoft.com/dotnet/aspnet:6.0

--platform=$BUILDPLATFORM
->
mcr.microsoft.com/dotnet/aspnet:6.0@sha256:3edfb4ea7067e24b3aa5c6ab585e85a26c7daabfec26829b8efabeb122de4364

 [atomist:generated]
 [atomist-skill:atomist/docker-base-image-policy]

Signed-off-by: Atomist Bot <bot@atomist.com>

nginx-aspnet-mysql/backend/Dockerfile

@@ -34,7 +34,7 @@ FROM builder AS publisher
 
 RUN ["dotnet", "publish", "-c", "Release", "-o", "/build"]
 
-FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/aspnet:6.0
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/aspnet:6.0@sha256:3edfb4ea7067e24b3aa5c6ab585e85a26c7daabfec26829b8efabeb122de4364
 
 WORKDIR /app
 COPY --from=publisher /build .