chore(tooling): use yarn for linting scripts (#149)

* chore(tooling): use yarn for linting scripts

* chore: fixes and tweaks

* chore(ci): more permissions

* chore: clean up, lint fixes

* chore: clean up, lint fixes

* chore: clean up, lint fixes

* chore(lint): fix yamllint errors and warnings

* chore(lint): lint fixes

* chore(lint): lint fixes

tools/install-ec.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Install editorconfig-checker if not already installed
+set -euo pipefail
+
+if command -v ec > /dev/null 2>&1; then
+  exit 0
+fi
+
+if ! command -v yarn > /dev/null 2>&1; then
+  echo "yarn is required to install editorconfig-checker" >&2
+  exit 1
+fi
+
+if yarn --version | grep -q '^1\.'; then
+  yarn global add --silent editorconfig-checker@"${VERSION:-latest}"
+else
+  yarn dlx --quiet editorconfig-checker@"${VERSION:-latest}" --version > /dev/null
+fi