Merge pull request 'Switching to a static docker image' (#549) from mohr/static_docker into development

Reviewed-on: fsfw/fsfw#549

automation/Jenkinsfile

@@ -3,13 +3,7 @@ pipeline {
         BUILDDIR = 'build-tests'
     }
     agent {
-        dockerfile {
-            dir 'automation'
-            //force docker to redownload base image and rebuild all steps instead of caching them
-            //this way, we always get an up to date docker image one each build
-            additionalBuildArgs  '--no-cache --pull'
-            reuseNode true
-        }
+        docker { image 'fsfw-ci:d1'}
     }
     stages {
         stage('Clean') {