ci(go-lint): golangci-lint v1.64.8 (go1.24) + new-from-merge-base (#32)

.gitea/workflows/ci.yaml

@@ -136,12 +136,14 @@ jobs:
     runs-on: docker
     needs: detect-changes
     if: github.event_name == 'pull_request' && needs.detect-changes.outputs.sdk == 'true'
-    container: golangci/golangci-lint:v1.62-alpine
+    container: golangci/golangci-lint:v1.64.8-alpine
     steps:
       - name: Checkout
         run: |
           apk add --no-cache git
-          git clone --depth 1 --branch ${GITHUB_HEAD_REF:-${GITHUB_REF_NAME}} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+          # Full clone so `main` is a local ref — new-from-merge-base needs the merge base.
+          git clone ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+          git checkout ${GITHUB_HEAD_REF:-${GITHUB_REF_NAME}}
       - name: Lint ai-compliance-sdk
         run: |
           [ -d "ai-compliance-sdk" ] || exit 0