Add script for checking all commits in a branch

scripts/check_commit.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Run some tests on the current commit, similar to what CI does; useful for
+# checking every commit in a branch with `git rebase -x scripts/check_commit.sh master`.
+
+set -e
+
+git diff --quiet || {
+  echo "Error: there are unstaged changes. Please stage or stash them before running this script."
+  exit 1
+}
+
+just test
+just lint
+just generate
+git diff --quiet || {
+  echo "Error: auto-generated files not up to date."
+  exit 1
+}