Add perl to alpine (should work now)

.github/workflows/ci.yml

@@ -184,7 +184,8 @@ jobs:
         # can't use setup-python because that python doesn't seem to work;
         # `python3-dev` (rather than `python:alpine`) for some ctypes reason,
         # `nodejs` for pyright (`node-env` pulls in nodejs but that takes a while and can time out the test).
-        run: apk update && apk add python3-dev bash nodejs
+        # `perl` for a platform independent `sed -i` alternative
+        run: apk update && apk add python3-dev bash nodejs perl
       - name: Enter virtual environment
         run: python -m venv .venv
       - name: Run tests