ci: use changed-files GHA to check for dirty git state

Author: dkoshkin

.github/workflows/checks.yml

@@ -171,8 +171,15 @@ jobs:
         env:
           SKIP: no-commit-to-branch,golangci-lint,actionlint-system
 
-      - name: Run git status and fail on a dirty state
-        run: devbox run -- make git.status
+      - name: Get changed files since last commit
+        id: changed-files
+        uses: tj-actions/changed-files@v44
+      - name: Fail if there are changed files
+        if: steps.changed-files.outputs.any_changed
+        uses: actions/github-script@v3
+        with:
+          script: |
+            core.setFailed('Discovered changed files: ${{ steps.changed-files.outputs.all_changed_files }}')
 
   lint-test-helm:
     runs-on: ubuntu-22.04

make/repo.mk

@@ -17,10 +17,3 @@ ifneq ($(shell git status --porcelain 2>/dev/null; echo $$?), 0)
 else
 	export GIT_TREE_STATE :=
 endif
-
-.PHONY: git.status
-git.status: ## Returns exit code of 1 if the git tree is dirty
-	@if [ -n "$(GIT_TREE_STATE)" ]; then \
-		git status --porcelain 2>/dev/null; \
-		exit 1; \
-	fi