Add a dockerfile for the powerjoular backend. This builds powerjoular version 1.1.0.

Author: joestubbs

external_plugins/power_measuring_plugin/Dockerfile-powerjoular

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+FROM ubuntu:24.04
+
+# get the ada compiler
+RUN apt-get update && apt-get install -y gnat gprbuild git
+
+# get the powerjoular source
+RUN git clone https://github.com/joular/powerjoular.git
+
+# compile the code
+WORKDIR /powerjoular
+RUN gprbuild
+
+# copy the binary to bin
+RUN cp obj/powerjoular /usr/bin/powerjoular
+
+# set powerjoular as the entrypoint 
+WORKDIR /
+ENTRYPOINT ["/usr/bin/powerjoular"]