added workflow

.github/workflows/check-space.yaml

@@ -0,0 +1,31 @@
+name: 'Clean up disk'
+on:
+    pull_request:
+        branches: [dev-cere]
+        types: [opened, synchronize, edited]
+jobs:
+    clean-up-disk:
+        runs-on: 'ubuntu-18.04'
+        steps:
+            - uses: actions/checkout@v2
+            - name: 'Checkout submodules'
+              run: 'git submodule update --init --recursive'
+            - name: 'current directory'
+              run: pwd
+            - name: 'disks space'
+              run: df -h
+            - name: 'current disk space'
+              run: df -Ph . | tail -1 | awk '{print $4}'
+            - name: 'top folders'
+              run: du -sh * /home/* | sort -hr | head -n10
+            - name: 'clean up 1'
+              run: sudo rm -rf "/usr/local/share/boost"
+            - name: 'current disk space 1'
+              run: df -Ph . | tail -1 | awk '{print $4}'
+            - name: 'clean up 2'
+              run: sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+            - name: 'current disk space 2'
+              run: df -Ph . | tail -1 | awk '{print $4}'
+            - name: 'docker version'
+              run: docker --version
+