Clean up build dir

To avoid the C++ test step failing due to suspected out-of-disk-space

.github/workflows/build_steps.yml

@@ -14,7 +14,7 @@ on:
       bucket:            {default: 'arcticdb-ci-test-bucket-01', type: string, description: The name of the S3 bucket that we will test against}
       endpoint:          {default: 's3.eu-west-2.amazonaws.com', type: string, description: The address of the S3 endpoint}
       region:            {default: 'eu-west-2', type: string, description: The S3 region of the bucket}
-      clear:             {default: 1, type: number, description: Controls wheather we will clear the libraries in the versions stores that we test against}   
+      clear:             {default: 1, type: number, description: Controls wheather we will clear the libraries in the versions stores that we test against}
 jobs:
   compile:
     strategy:
@@ -115,6 +115,13 @@ jobs:
         if: inputs.job_type == 'cpp-tests'
         run: cd cpp; cmake --build --preset $ARCTIC_CMAKE_PRESET --target install
 
+      - name: Clean up build dir # To save disk space as we're close to the limit on Linux
+        if: inputs.job_type == 'cpp-tests' && matrix.os == 'linux'
+        run: |
+          cd $ARCTICDB_BUILD_DIR/*-build
+          du -m --max-depth=2 | sort -n | tail -n 50
+          nohup rm -rf * &  # Clean up while the test is running to save build time
+
       - name: C++ Rapidcheck
         if: inputs.job_type == 'cpp-tests'
         run: cpp/out/install/arcticdb_rapidcheck_tests
@@ -162,7 +169,7 @@ jobs:
       # ========================= Common =========================
       - name: Disk usage
         if: always()
-        run: du -m . "${{matrix.build_dir}}" | sort -n | tail -n 100 ; df -h
+        run: du -m . "${{matrix.build_dir}}" | sort -n | tail -n 50 ; df -h
         continue-on-error: true
 
       - name: Make build directory readable for archiving
@@ -272,7 +279,7 @@ jobs:
           aws_access_key: "${{ secrets.AWS_S3_ACCESS_KEY }}"
           aws_secret_key: "${{ secrets.AWS_S3_SECRET_KEY }}"
           strategy_branch: "${{ env.distinguishing_name }}"
-      
+
       - name: Run test
         run: |
           build_tooling/parallel_test.sh tests/${{matrix.type}}