add Dockerfile for ubuntu

Jenkinsfile

@@ -28,7 +28,7 @@ node {
         _envmap["${_n}"] = "${_v}";
     }
 	def _msg = "Built images:"
-    def platforms = ['debian', 'osx', 'windows', 'android', 'pi']
+    def platforms = ['debian', 'osx', 'windows', 'android', 'pi', 'ubuntu']
 	for (int i = 0; i < platforms.size(); ++i) {
 	    if (_envmap["BUILD_${platforms[i]}"] == "1") {
 			stage("${platforms[i]}-shstk") {

docker/ubuntu-shstk/Dockerfile

@@ -0,0 +1,17 @@
+ARG DOCKER_PREFIX=wapmobil/
+FROM ${DOCKER_PREFIX}ubuntu
+
+ARG LIBS_BUILD_NUMBER=9999
+ARG JOBS_COUNT=4
+ENV PATH=/opt/cmake/bin:$PATH 
+
+WORKDIR /soft
+RUN git clone -b master --single-branch --depth 1 --recursive https://git.shs.tools/SHS/shstk.git
+
+WORKDIR /soft/shstk_build_ubuntu
+RUN cmake -DICU=0 -DLOCAL=0 -DQGLENGINE=1 -DQGLVIEW=1 -DBUILD_NUMBER=${LIBS_BUILD_NUMBER} ../shstk \
+ && make install -j${JOBS_COUNT} \
+ && rm -rf * \
+ && ldconfig
+ 
+WORKDIR /soft/src