Add requirements.txt for python package dependencies

Jenkinsfile

@@ -71,6 +71,8 @@ for (int i = 0; i < osxPlatforms.size(); i++) {
         "LIBRARY_PATH=$triqsDir/lib:${env.BREW}/lib",
         "CMAKE_PREFIX_PATH=$triqsDir/lib/cmake/triqs"]) {
         deleteDir()
+        /* note: this is installing into the parent (triqs) venv (install dir), which is thus shared among apps and so not be completely safe */
+        sh "pip install -r $srcDir/requirements.txt"
         sh "cmake $srcDir -DCMAKE_INSTALL_PREFIX=$installDir -DTRIQS_ROOT=$triqsDir"
         sh "make -j3"
         try {

requirements.txt

@@ -0,0 +1 @@
+# Required python packages for this application (these should also be added to Dockerfile for Jenkins)