Add docker wrappers of a few YAML parsers for easy testing

tools/parsers/build.ps1

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+
+dir -Attributes Directory | % {
+    docker build $_.Name -t "aaubry/yaml-$($_.Name)"
+}
+
+dir -Attributes Directory | % {
+    Write-Host "echo a:b | docker run --rm -i aaubry/yaml-$($_.Name)"
+}

tools/parsers/perl-yaml-pp/Dockerfile

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+FROM ubuntu:20.04
+
+RUN apt-get update && apt-get install -y libyaml-pp-perl
+COPY parse.pl /app/
+WORKDIR /app
+
+ENTRYPOINT [ "/usr/bin/perl", "-w", "/app/parse.pl" ]

tools/parsers/perl-yaml-pp/parse.pl

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+use YAML::PP qw/ Load Dump /;
+
+my $input;
+while(<>) {
+   $input .= $_;
+}
+
+my $doc = Load($input);
+print(Dump($doc));

tools/parsers/python/Dockerfile

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+FROM ubuntu:20.04
+
+RUN apt-get update && apt-get install -y python3 python3-yaml
+WORKDIR /app
+
+ENTRYPOINT [ "/usr/bin/python3", "-c", "import sys, yaml, json; print(json.dumps(yaml.load(sys.stdin.read(), Loader=yaml.SafeLoader)))" ]

tools/parsers/reference/Dockerfile

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+FROM ubuntu:20.04
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y cabal-install git
+RUN cabal update
+RUN git clone https://github.com/orenbenkiki/yamlreference.git .
+RUN cabal install --only-dependencies
+RUN cabal configure
+RUN cabal build
+COPY run.sh /app/
+
+ENTRYPOINT [ "/usr/bin/bash", "/app/run.sh" ]

tools/parsers/reference/run.sh

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+
+if [ "$1" == "--html" ]; then
+    /app/dist/build/yaml2yeast/yaml2yeast <&0 | /app/yeast2html
+else
+    echo "Use --html for HTML output"
+    /app/dist/build/yaml2yeast/yaml2yeast <&0 | grep --color -E '^!.*|$'
+fi