Change CI yml

.gitlab-ci.yml

+image: docker.nt.uni-saarland.de/docker/prrt-builder:20.04
+
 variables:
   PYPI_USER: SECURE
   PYPI_PASSWORD: SECURE
@@ -12,7 +14,7 @@ stages:
 build:prrt:
   stage: build
   tags:
-    - cmake
+    - docker
   artifacts:
     name: "$CI_BUILD_REF_NAME$"
     untracked: true
@@ -24,7 +26,7 @@ build:prrt:
     - which g++
     - pip3 list --format=legacy | grep Cython
     - pip3 list --format=legacy | grep numpy
-    - CC=gcc-5 CXX=g++-5 cmake .
+    - cmake .
     - make
 
 test:prrt_mem:
@@ -32,7 +34,7 @@ test:prrt_mem:
   dependencies:
     - build:prrt
   tags:
-    - valgrind
+    - docker
   script:
     - bash tests/memtest.sh
 
@@ -41,25 +43,24 @@ test:prrt_functional:
   dependencies:
     - build:prrt
   tags:
-    - bash
+    - docker
   script:
     - rm CMakeCache.txt
-    - CC=gcc-5 CXX=g++-5 cmake . -DPRRT_TESTS=1
+    - cmake . -DPRRT_TESTS=1
     - make
     - exec ./prrtTests
 
 test:prrt_python_bindings:
   stage: test
   tags:
-    - bash
-    - python3
+    - docker
   script:
     - sh tests/build.sh
 
 deploy:pypi:
   stage: deploy
   tags:
-    - python3
+    - docker
   script:
     - echo "[distutils]" >> ~/.pypirc
     - echo "index-servers =" >> ~/.pypirc
@@ -75,11 +76,11 @@ deploy:pypi:
 deploy:profile:
   stage: deploy
   tags:
-    - gprof
+    - docker
   script:
     - ls -lahv
     - rm CMakeCache.txt
-    - CC=gcc-5 CXX=g++-5 cmake . -DGPROF=1
+    - cmake . -DGPROF=1
     - make
     - bash profiling/profile.sh
   artifacts: