jenkins: use post for after build actions

Jenkinsfile

@@ -26,7 +26,11 @@ pipeline {
             sh 'mkdir build; cd build; ${QT_PATH}/${QMAKE_VER} -r ${WORKSPACE}/qgroundcontrol.pro CONFIG+=${QGC_CONFIG} CONFIG+=WarningsAsErrorsOn'
             sh 'cd build; make -j`nproc --all`'
             sh 'ccache -s'
-            sh 'git clean -ff -x -d .'
+          }
+          post {
+            cleanup {
+              sh 'git clean -ff -x -d .'
+            }
           }
         }
 
@@ -51,7 +55,11 @@ pipeline {
             sh 'mkdir build; cd build; ${QT_PATH}/${QMAKE_VER} -r ${WORKSPACE}/qgroundcontrol.pro CONFIG+=${QGC_CONFIG} CONFIG+=WarningsAsErrorsOn'
             sh 'cd build; make -j`nproc --all`'
             sh 'ccache -s'
-            sh 'git clean -ff -x -d .'
+          }
+          post {
+            cleanup {
+              sh 'git clean -ff -x -d .'
+            }
           }
         }
 
@@ -76,7 +84,11 @@ pipeline {
             sh 'mkdir build; cd build; ${QT_PATH}/${QMAKE_VER} -r ${WORKSPACE}/qgroundcontrol.pro CONFIG+=${QGC_CONFIG} CONFIG+=WarningsAsErrorsOn'
             sh 'cd build; make -j`nproc --all`'
             sh 'ccache -s'
-            sh 'git clean -ff -x -d .'
+          }
+          post {
+            cleanup {
+              sh 'git clean -ff -x -d .'
+            }
           }
         }
 
@@ -100,7 +112,11 @@ pipeline {
             sh 'mkdir build; cd build; ${QT_PATH}/${QMAKE_VER} -r ${WORKSPACE}/qgroundcontrol.pro CONFIG+=${QGC_CONFIG} CONFIG+=WarningsAsErrorsOn'
             sh 'cd build; make -j`sysctl -n hw.ncpu`'
             sh 'ccache -s'
-            sh 'git clean -ff -x -d .'
+          }
+          post {
+            cleanup {
+              sh 'git clean -ff -x -d .'
+            }
           }
         }
 
@@ -124,8 +140,14 @@ pipeline {
             sh 'mkdir build; cd build; ${QT_PATH}/${QMAKE_VER} -r ${WORKSPACE}/qgroundcontrol.pro CONFIG+=${QGC_CONFIG} CONFIG+=WarningsAsErrorsOn'
             sh 'cd build; make -j`sysctl -n hw.ncpu`'
             sh 'ccache -s'
-            archiveArtifacts(artifacts: 'build/**/*.dmg', fingerprint: true, onlyIfSuccessful: true)
-            sh 'git clean -ff -x -d .'
+          }
+          post {
+            success {
+              archiveArtifacts(artifacts: 'build/**/*.dmg', fingerprint: true)
+            }
+            cleanup {
+              sh 'git clean -ff -x -d .'
+            }
           }
         }
       } // parallel