Add fuzz test to CI/CD.

Author: bwoodsend

.github/workflows/fuzz.yml

@@ -0,0 +1,19 @@
+name: Fuzz
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install
+        run: |
+          python -m pip install -U pip
+          python -m pip install .
+        env:
+          CFLAGS: '-DDEBUG'
+
+      - name: Fuzz
+        run: python tests/fuzz.py --seed=0:1000