build a custom docker image and push to a custom registry

build-custom-docker-image.Dockerfile

#ِDockerfile content
FROM ubuntu:latest

RUN apt update -y
RUN apt install -y openjdk-11-jdk
RUN apt install -y dotnet6


#build then push to any registry
#> docker build -t dotnet6-openjdk11 .
#> docker image tag dotnet6-openjdk11:latest full-path-url-in-your-private-registry/sdk-6.0-openjdk-11:latest
#> docker push full-path-url-in-your-private-registry/sdk-6.0-openjdk-11:latest

#usage in your application dockerfile first line use your custom image:
#> image: full-path-url-in-your-private-registry/sdk-6.0-openjdk-11
#enjoy