Update trusty Dockerfile

Trusty dockerfile now uses the correct syntax for building and
installing. There are the necessary commands to build the AppImage.

docker/Dockerfile.ubuntu_trusty

@@ -29,13 +29,16 @@ RUN git clone -b $git_branch "https://github.com/crapp/labpowerqt.git" && \
         cmake -DCMAKE_BUILD_TYPE=Release \
           -DCMAKE_C_COMPILER=gcc-6 \
           -DCMAKE_CXX_COMPILER=g++-6 \
-          -DCMAKE_PREFIX_PATH=/opt/qt58 ../ && \
-        make -j $make_core
+          -DCMAKE_PREFIX_PATH=/opt/qt58 \
+          -DCMAKE_INSTALL_PREFIX=/usr ../ && \
+        make -j $make_core && \
+        make DESTDIR=appdir install
 
 RUN wget -nv "https://github.com/probonopd/linuxdeployqt/releases/download/continuous/linuxdeployqt-continuous-x86_64.AppImage" && \
         cd labpowerqt/build && \
-        find \( -name "moc_*" -or -name "*.o" -or -name "qrc_*" -or -name "Makefile*" -or -name "*.a" \) -exec rm -v {} \; && \
-        mv -v ../../linuxdeployqt-continuous-x86_64.AppImage ./linuxdeployqt && chmod a+x linuxdeployqt
+        #find \( -name "moc_*" -or -name "*.o" -or -name "qrc_*" -or -name "Makefile*" -or -name "*.a" \) -exec rm -v {} \; && \
+        mv -v ../../linuxdeployqt-continuous-x86_64.AppImage ./linuxdeployqt && \
+        chmod a+x linuxdeployqt
 
 CMD /bin/bash
 
@@ -44,6 +47,11 @@ CMD /bin/bash
 # run docker container interactively and allow access to fuse device
 # docker run -it --cap-add SYS_ADMIN --device /dev/fuse trustylab
 # enter labpowerqt build directory and run linuxdeployqt
-# ./linuxdeployqt -verbose=3 -appimage -bundle-non-qt-libs src/labpowerqt
+#
+# source /opt/qt5*/bin/qt5*-env.sh
+# ./linuxdeployqt appdir/usr/share/applications/*.desktop -bundle-non-qt-libs && \
+# ./linuxdeployqt appdir/usr/share/applications/*.desktop -appimage
+#
 # use docker cp to copy the generated appimage. the appimage has the same
 # architecture than the host system.
+#