Added Dockerfile

Dockerfile

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+FROM bitnami/kubectl:1.22
+
+USER root
+
+RUN apt-get update && \
+    apt-get install -y git && \
+    rm -r /var/lib/apt/lists /var/cache/apt/archives 
+
+RUN mkdir -p /tmp/krew && chown 1001 /tmp/krew 
+RUN mkdir -p /.krew && chown 1001 /.krew
+
+ADD check_full_pvs.sh /
+RUN chmod g+rwX /check_full_pvs.sh
+
+USER 1001
+
+RUN cd /tmp/krew && curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/krew-linux_amd64.tar.gz" && \
+  tar zxvf "krew-linux_amd64.tar.gz" && ./krew-linux_amd64 install krew && rm -f krew-linux_amd64*
+
+ENV PATH="$HOME/.krew/bin:/opt/bitnami:$PATH"
+
+RUN kubectl krew install df-pv
+
+ENTRYPOINT [ "/check_full_pvs.sh" ]