Add CPAN Package Manager Environment for OSV-Scalibr

perl-cpan/Dockerfile

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+# Use Ubuntu 22.04 base
+FROM ubuntu:22.04
+
+# Install bash explicitly (Ubuntu images usually have it, but to be safe)
+RUN apt-get update && apt-get install -y bash gcc make perl
+
+# Configure CPAN
+RUN echo "yes" > CPAN
+
+# Install cpan module dependency from the following recommendation: https://www.cpan.org/modules/INSTALL.html
+RUN cpan App::cpanminus
+
+# Install some CPAN modules along with their dependencies
+RUN cpanm JSON LWP::UserAgent Try::Tiny Class::Data::Inheritable@0.08
+
+# App for putting scalibr binary inside the container
+RUN mkdir -p /app
+
+# Set working directory (optional)
+WORKDIR /app
+
+# Default command: start bash so the container stays alive interactively
+CMD ["/bin/bash"]

perl-cpan/README.md

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+# OSV-Scalibr: Perl Package Manager CPAN Extractor
+
+This directory contains the test Dockerfile for testing OSV-Scalibr Perl Package Manager CPAN Extractor plugin. The Comprehensive Perl Archive Network (CPAN) currently has 10,000 Perl modules in 10,000 distributions, written by 10,000 authors, mirrored on 1 server. Each CPAN package contains a META.json file that stores their metadata. This plugin finds and extracts these files to determine the inventory.
+
+## Setup
+
+```sh
+docker build -t cpan-test .
+docker run -it --rm -v $(pwd):/app cpan-test (to put scalibr binary inside the container)
+```