ci(#49):

correct diff algorithm

Signed-off-by: Bryant Finney <[email protected]>

.github/workflows/pr.yml

@@ -40,7 +40,7 @@ jobs:
           printf "%s\n" "${{ env.DOCKER_FILES }}" | sort >$TYPES_DIR/docker-files.txt
 
       - name: 📝 List changes
-        run: git diff --name-only ${{ github.base_ref }} ${{ github.head_ref }} | sort >/tmp/changes.txt
+        run: gh pr diff --name-only ${{ github.event.number }} | sort >/tmp/changes.txt
 
       - name: ❔ Compare
         id: compare