Free up more space on GitHub Actions CI. (#234)

* Free up more space on GitHub Actions CI.

This is from GitHub support recommendation:
https://github.community/t5/GitHub-Actions/BUG-Strange-quot-No-space-left-on-device-quot-IOExceptions-on/m-p/47691/highlight/true#M6920

* Trigger fuzzers CI.

* Add more df's to see swap file size.

* Remove unneeded df's, only leave one at end.

.github/workflows/build.py

@@ -56,7 +56,7 @@ def delete_docker_images():
     """Delete docker images."""
     # TODO(metzman): Don't delete base-runner/base-builder so it
     # doesn't need to be pulled for every target.
-    result = subprocess.run(['docker', 'images', '-q'],
+    result = subprocess.run(['docker', 'images', '-a', '-q'],
                             stdout=subprocess.PIPE,
                             check=True)
     image_names = result.stdout.splitlines()

.github/workflows/fuzzers.yml

@@ -39,10 +39,20 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+
+    - name: Clear unnecessary files
+      run: |
+        sudo swapoff -a
+        sudo rm -f /swapfile
+        sudo apt clean
+        docker rmi $(docker images -a -q)
+        df -h
+
     - name: Setup Python environment
       uses: actions/[email protected]
       with:
         python-version: 3.7
+
     - name: Build Benchmarks
       run: |
         python .github/workflows/build.py $BENCHMARK_TYPE $FUZZER

fuzzers/test_utils.py

@@ -82,7 +82,7 @@ def test_initialize_flags_in_environment(environ):
 
 
 def test_initialize_flags_in_var():
-    """Test that CFLAGS and CXXFLAGS are correctly initializedin variable."""
+    """Test that CFLAGS and CXXFLAGS are correctly initialized in variable."""
     env = {}
     utils.initialize_flags(env)
     assert env.get('CFLAGS') == ('-pthread -Wl,--no-as-needed -Wl,-ldl -Wl,-lm '