Add VDI Test Image for OSV-Scalibr

Related PR: google/osv-scalibr#1348
Related issue: google/osv-scalibr#1216

Signed-off-by: Yuvraj Saxena <ysaxenax@gmail.com>

Author: 0xXA

vdi/Dockerfile

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+FROM ubuntu:22.04
+
+RUN apt-get update
+
+RUN mkdir -p /testdata
+
+# Set working directory
+WORKDIR /testdata
+
+# Copy valid .vdi file into the container
+COPY valid.vdi /testdata/valid.vdi
+
+CMD ["/bin/bash"]

vdi/README.md

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+# OSV-Scalibr: VMDK Extractor
+
+This directory contains a test Dockerfile for validating OSV-Scalibr's VMDK Extractor plugin. A VMDK (Virtual Machine Disk) file is a disk image format commonly used by virtual machines to emulate a physical hard drive.
+
+## Setup
+
+### Build the Docker Image
+
+```bash
+cd security-testbeds/vmdk
+docker build -t vmdk-extractor-testbed .
+```
+
+### Run the Container
+
+```bash
+docker run -it --rm vmdk-extractor-testbed /bin/bash
+```
+
+### Running OSV-Scalibr
+
+Build or copy the `scalibr` binary to the current directory, and inside the container, run `scalibr` with the vmdk extractor:
+
+```bash
+./scalibr --extractors=embeddedfs/vmdk --result=output.textproto valid.vmdk
+```