ci/cd: run linter only on backend changes

.github/workflows/backend-linter.yml

@@ -1,12 +1,15 @@
 name: Run Backend Linter
 
 on:
-    push:
-        branches:
-            - main
-    pull_request:
-        branches:
-            - main
+  push:
+    branches: [main]
+    paths:
+      - "backend/**"
+  pull_request:
+    branches: [main]
+    paths:
+      - "backend/**"
+
 permissions:
   # Required: allow read access to the content for analysis.
   contents: read
@@ -16,21 +19,21 @@ permissions:
   checks: write
 
 jobs:
-    golangci-lint:
-        name: Run Golangci-lint
-        runs-on: ubuntu-latest
-        steps:
-            - name: Checkout code
-              uses: actions/checkout@v4
+  golangci-lint:
+    name: Run Golangci-lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
 
-            - name: Set up Go
-              uses: actions/setup-go@v4
-              with:
-                  go-version-file: backend/go.mod
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: backend/go.mod
 
-            - name: Run Golangci-lint
-              uses: golangci/golangci-lint-action@55c2c1448f86e01eaae002a5a3a9624417608d84 # v6.5.2
-              with:
-                version: v1.64
-                working-directory: backend
-                only-new-issues: ${{ github.event_name == 'pull_request' }}
+      - name: Run Golangci-lint
+        uses: golangci/golangci-lint-action@55c2c1448f86e01eaae002a5a3a9624417608d84 # v6.5.2
+        with:
+          version: v1.64
+          working-directory: backend
+          only-new-issues: ${{ github.event_name == 'pull_request' }}