add conan docker image and build docker image only if changes where made in its config

Docker/Linux_Conan/.gitlab-ci.yml

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+
+# trigger docker rebuild if chages where made
+Linux_Conan:
+  stage: docker
+  image: docker:latest
+  services:
+    - docker:dind
+  script:
+    - docker build -t test .
+  only:
+    changes:
+      - Docker/Linux_Conan/*

Docker/Linux_Conan/Dockerfile

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+FROM gcc:latest
+
+ENV PATH=/usr/local/texlive/bin/x86_64-linuxmusl:$PATH
+
+COPY ./build.sh /tmp/
+
+RUN bash /tmp/build.sh
+
+# Expose /home as workin dir
+WORKDIR /home
+VOLUME ["/home"]

Docker/Linux_Conan/build.sh

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+#!/bin/bash
+
+apt-get update
+apt-get install cmake python3-pip -y -qq
+pip3 install conan
+
+git clone https://gitlab.heili.eu/lukas/dynuiprefresher.git
+cd dynuiprefresher || exit
+git checkout conansupport
+
+conan profile new default --detect --force # Generates default profile detecting GCC and sets old ABI
+conan profile update settings.compiler.libcxx=libstdc++11 default  # Sets libcxx to C++11 ABI
+conan remote add bintray https://api.bintray.com/conan/lheili/LibConfig --force
+conan remote add bincrafters https://api.bintray.com/conan/bincrafters/public-conan --force
+mkdir -p build # create build folder
+CONAN_SYSREQUIRES_MODE=enabled CONAN_SYSREQUIRES_SUDO=0 conan install . --build=missing -g none
+
+# cleanup
+cd ..
+
+rm -Rf ./dynuiprefresher
+rm -rf /var/lib/apt/lists/*
+rm /tmp/build.sh