add (failing) test for checksums

Author: mattip

.github/workflows/nikola.yml

@@ -19,7 +19,7 @@ jobs:
       uses: actions/checkout@v2
     - name: Build docs
       shell: bash
-      run: |
+      run: python3 check_checksums.py
         sudo apt install virtualenv
         make build
     - name: Deploy

check_checksums.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+def main(fname):
+
+    with open(fname) as fid:
+        for line in fid:
+            if line.startswith('   '):
+                parts = line.strip().split(' ')
+                if len(parts[0]) != 3:
+                    raise ValueError(f'bad checksum in {line}')
+
+if __name__ == "__main__":
+    main('pages/checksums.rst')
+