ci/cd: add basic static analysis for backend (#389)

.github/workflows/backend-linter.yml

@@ -0,0 +1,36 @@
+name: Run Backend Linter
+
+on:
+    push:
+        branches:
+            - main
+    pull_request:
+        branches:
+            - main
+permissions:
+  # Required: allow read access to the content for analysis.
+  contents: read
+  # Optional: allow read access to pull request. Use with `only-new-issues` option.
+  pull-requests: read
+  # Optional: allow write access to checks to allow the action to annotate code in the PR.
+  checks: write
+
+jobs:
+    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: 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' }}