Add acceptmobile to ci.

.github/workflows/ci.yml

@@ -86,6 +86,24 @@ jobs:
           fi
           exit $exit_code
 
+    # Skipping acceptance tests for 3.8, just to save some time.
+    - name: Mobile acceptance testing
+      if: matrix.python_version != '3.8'
+      uses: nick-fields/retry@v3
+      with:
+        max_attempts: 3
+        timeout_minutes: 30
+        command: |
+          # handle errors manually, so that the retry works.
+          exit_code=0
+          # Have to explicitly set MECAB_PATH for natto-py.
+          export MECAB_PATH=/lib/x86_64-linux-gnu/libmecab.so.2
+          inv acceptmobile --show --verbose || exit_code=$?
+          if [ "$exit_code" -ne 0 ]; then
+              echo "Command failed with exit code $exit_code, retrying..."
+          fi
+          exit $exit_code
+
     # Playwright tests were hanging far too often on github ci,
     # but not consistently.  No idea what was going wrong.
     # TODO github ci: fix playwright hanging.