Remove linux images and revise the readme (#37)

Author: Torch3333

Diff for: oracle-jdk-installer/windows/11/Dockerfile renamed to oracle-jdk-installer-for-windows/11/Dockerfile

@@ -0,0 +1,51 @@
+# Docker images containing installer for Oracle JDK 8 and 11 on Windows
+
+This folder contains Dockerfiles to build images that contain Oracle JDK 8 or 11 installer for Windows.
+We need such image because no [official Oracle JDK image](https://container-registry.oracle.com/ords/ocr/ba/java/jdk) for Windows architecture exists to this date.
+These image purpose is to help install Oracle JDK 8 and 11 on the GitHub Windows action runner.
+The runner will create the image containing the JDK installer and copy it locally for installation after which the started image is discarded.
+For example, the runner will do the following steps to retrieve JDK 8 installer:
+
+```console
+$container_id=$(docker create "ghcr.io/scalar-labs/oracle/jdk:8-windows")
+docker cp "${container_id}:oracle-jdk.exe" .
+docker rm "$container_id"
+//Continue with the JDK installation
+```
+
+The capability of the `mcr.microsoft.com/oss/kubernetes/windows-host-process-containers-base-image` base image is irrelevant since the container is never run. 
+It was selected solely because its memory footprint is very light (7KB).
+
+## How to build the images 
+### Download the JDK installer
+
+Download the `Windows x64 Installer` installer from [Oracle website](https://www.oracle.com/java/technologies/downloads/archive/#JavaSE) for JDK 8 and 11. An Oracle account (registration is free) is needed.
+
+Then put the downloaded files in the corresponding directories with the Dockerfile
+
+### Build the Docker images
+
+These builds steps are directly taken from the base image `mcr.microsoft.com/oss/kubernetes/windows-host-process-containers-base-image` [GitHub repository](https://github.com/microsoft/windows-host-process-containers-base-image?tab=readme-ov-file#build-with-buildkit).
+
+To be able to build a Windows image on a Linux machine, we need to create a specific build environment.
+
+```console
+docker buildx create --name img-builder --use --platform windows/amd64
+```
+
+Since the image requires a Windows architecture, it cannot be exported locally after being build,
+we need to push it to the registry right away.
+
+The following commands will build then push the Windows image to the Scalar GitHub registry.
+
+#### For JDK 8
+
+```console
+docker buildx build --platform windows/amd64 --output=type=registry -t ghcr.io/scalar-labs/oracle/jdk:8-windows -t ghcr.io/scalar-labs/oracle/jdk:8u401-windows ./8
+```
+
+#### For JDK 11
+
+```console
+docker buildx build --platform windows/amd64 --output=type=registry -t ghcr.io/scalar-labs/oracle/jdk:11-windows -t ghcr.io/scalar-labs/oracle/jdk:11.0.22-windows ./11
+```