add cleanup job

.gitlab-ci.yml

@@ -3,6 +3,7 @@ stages:
   - cmake
   - build
   - post
+  - cleanup
 
 image: conanio/gcc9:latest
 
@@ -19,6 +20,7 @@ conan:
     - conan user lukas-heiligenbrunner -r bintray -p $CONAN_KEY
     - conan remote add bincrafters https://api.bintray.com/conan/bincrafters/public-conan
     - CONAN_SYSREQUIRES_MODE=enabled conan install .. --build=missing
+  allow_failure: true
 
 # Unix Build
 cmake:
@@ -26,3 +28,11 @@ cmake:
   script:
     - cd build
     - cmake -S . -B ../build -D WinBuild=OFF -D GUI=OFF
+  allow_failure: true
+
+cleanup:
+  stage: cleanup
+  script:
+    - echo "cleaning up"
+  after_script:
+    - rm -Rfv build