build: Provide AppImage package for Linux (issue #279) (#945)

* Create AppImage package using linuxdeployqt in Travis CI
* Renamed appPath() to sharedDataPath()
* Fixed include error in tutorial

deployment/dockerfiles/linux/travis_ci/Dockerfile

@@ -1,5 +1,21 @@
 FROM coatisoftware/centos7_64_qt_llvm:qt5126-llvm900
 
+# TODO: remove after full image rebuilt ------------------------------------
+USER root
+
+RUN yum -y install file
+
+RUN wget https://github.com/probonopd/linuxdeployqt/releases/download/6/linuxdeployqt-6-x86_64.AppImage && \
+chmod a+x linuxdeployqt-6-x86_64.AppImage && \
+./linuxdeployqt-6-x86_64.AppImage --appimage-extract && \
+cp -r squashfs-root/usr/ /opt/linuxdeployqt && \
+chmod -R 755 /opt/linuxdeployqt && \
+rm linuxdeployqt-6-x86_64.AppImage && rm -rf squashfs-root
+ENV PATH=/opt/linuxdeployqt/bin:${PATH}
+
+USER builder
+# --------------------------------------------------------------------------
+
 COPY entrypoint.sh /entrypoint.sh
 
 ENTRYPOINT ["/entrypoint.sh"]

deployment/dockerfiles/linux/travis_ci/entrypoint.sh

@@ -14,5 +14,8 @@ git checkout $1
 
 ./script/build.sh release test
 
+./setup/Linux/createAppImage.sh
+
 mkdir release
 cp ./Sourcetrail*.tar.gz ./release/
+cp ./Sourcetrail*.AppImage ./release/