feat: add action to generate CRD md documentation from yaml

generate-crd-docs/Dockerfile

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+FROM golang:1.17-bullseye
+
+
+RUN apt-get update && apt-get install -y git curl apt-transport-https
+RUN curl https://baltocdn.com/helm/signing.asc | apt-key add - && \
+    echo "deb https://baltocdn.com/helm/stable/debian/ all main" | tee /etc/apt/sources.list.d/helm-stable-debian.list  && \
+    apt-get update && \
+    apt-get install -y helm
+RUN go install fybrik.io/[email protected]
+
+WORKDIR /action
+
+CMD crdoc --resources ${RESOURCES} --output ${OUTPUT}

generate-crd-docs/README.md

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+# Generate CRD documentation
+
+A simple docker action that generates a markdown documentation from a CRD yaml.
+Uses [crdoc](https://github.com/fybrik/crdoc).

generate-crd-docs/action.yaml

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+name: "generate-crd-docs"
+description: "Generate Markdown documentation from CRDs. Uses https://github.com/fybrik/crdoc."
+runs:
+  using: "docker"
+  image: "Dockerfile"
+branding:
+  icon: "activity"
+  color: "blue"