fix(ci): avoid failing "dirname"-cleanup PRs (#1405)

.github/ci/run_sanitizer.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -e
+
+REF_BRANCH="$1"
+PR_BRANCH="$2"
+
+# checks for added lines that contain search pattern and prints them
+SEARCH_PATTERN="(dirname|fn\.cwd)"
+
+if git diff --pickaxe-all -U0 -G "${SEARCH_PATTERN}" "${REF_BRANCH}" "${PR_BRANCH}" -- '*.lua' | grep -Ev '(configs|utils)\.lua$' | grep -E "^\+.*${SEARCH_PATTERN}" ; then
+  echo
+  echo 'String "dirname" found. There is a high risk that this might contradict the directive:'
+  echo '"Do not add vim.fn.cwd or util.path.dirname in root_dir".'
+  echo "see: https://github.com/neovim/nvim-lspconfig/blob/master/CONTRIBUTING.md#adding-a-server-to-lspconfig."
+  exit 1
+fi

.github/workflows/check-for-dirname.yml

@@ -1,18 +0,0 @@
-name: "Dirname Checker"
-on: [pull_request]
-jobs:
-  dirname-check:
-    runs-on: ubuntu-latest
-    env:
-      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    steps:
-      - uses: actions/checkout@v2.3.1
-        with:
-          fetch-depth: 0
-          ref: ${{ github.event.pull_request.head.sha }}
-      - run: |
-          if ! git log -G"dirname" --exit-code origin/$GITHUB_BASE_REF..$(git branch --show-current) -- . ':!lua/lspconfig/configs.lua'; then
-            echo
-            echo 'String "dirname" found. There is a high risk that this might contradict the directive "Do not add vim.fn.cwd or util.path.dirname in root_dir" specified in https://github.com/neovim/nvim-lspconfig/blob/master/CONTRIBUTING.md#adding-a-server-to-lspconfig.'
-            exit 1
-          fi

.github/workflows/sanitizer.yml

@@ -0,0 +1,15 @@
+name: "Dirname Checker"
+on: [pull_request]
+jobs:
+  disallowed-root-checker:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2.3.1
+        with:
+          fetch-depth: 0
+      - run: |
+          if ! bash .github/ci/run_sanitizer.sh ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }}; then
+            exit 1
+          fi