Add post-commit CI hook

dev/hooks/post-commit

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+root="$(pwd)"
+branch=$(git symbolic-ref HEAD 2>/dev/null || echo "?")
+branch="${branch##refs/heads/}"
+
+if ! [ "$branch" = "main" ]; then
+    exit 0;
+fi
+
+cleanup() {
+    echo -e "\033[31mTests aborted.\033[0m"
+    rm -rf "$root/.test";
+    exit;
+}
+
+trap cleanup SIGHUP SIGINT SIGABRT SIGTERM;
+
+cat <<EOF
+I see you've committed to $branch! Time to test.
+(Press ^C to abort.)
+
+EOF
+
+rm -rf "$root/.test"
+mkdir "$root/.test" || exit;
+cd "$root/.test" || exit;
+git clone .. repo 2>> "$root/.test/results"
+cd "$root/.test/repo" 2>> "$root/.test/results" || exit;
+if make test-ci &>> "$root/.test/results"; then
+    grep 'Done fetching communities' -A1 --color=no "$root/.test/results";
+    cat <<EOF
+Tests passed.
+Run \`make dev\` to test it yourself.
+EOF
+else
+    echo -e "\033[31mTests failed.\033[0m";
+    tail -n10 "$root/.test/results";
+    echo "See $root/.test/results for the full log."
+    exit;
+fi
+cd "$root" || exit;
+# rm -rf .test