Preserve explicit directory markers with octet-stream MIME (#8726)

* Preserve octet-stream MIME on explicit directory markers

* Run empty directory marker regression in CI

* Run S3 Spark workflow for filer changes

.github/workflows/s3-example-integration-tests.yml

@@ -47,6 +47,14 @@ jobs:
           echo "=== Running S3 DeleteBucketNotEmpty Tests ==="
           go test -v -timeout=60s -run TestS3DeleteBucketNotEmpty ./...
 
+      - name: Run S3 Empty Directory Marker Tests
+        timeout-minutes: 15
+        working-directory: test/s3/normal
+        run: |
+          set -x
+          echo "=== Running S3 Empty Directory Marker Tests ==="
+          go test -v -timeout=180s -run TestS3ListObjectsEmptyDirectoryMarkers ./...
+
       - name: Run IAM Integration Tests
         timeout-minutes: 15
         working-directory: test/s3/normal

.github/workflows/s3-spark-tests.yml

@@ -4,6 +4,7 @@ on:
   pull_request:
     paths:
       - 'weed/s3api/**'
+      - 'weed/filer/**'
       - 'test/s3/spark/**'
       - 'test/s3tables/testutil/**'
       - '.github/workflows/s3-spark-tests.yml'