s3api: add Snowflake s3compat API integration tests (#11394)

* s3api: add Snowflake s3compat API integration tests

Run the upstream snowflakedb/snowflake-s3compat-api-test-suite against a
local SeaweedFS server in CI. test/s3/snowflake/run.sh starts weed server
with S3 (-s3.autoCreateBucket=false so missing-bucket PUTs return
NoSuchBucket), prepares the fixtures the suite needs (versioned bucket,
deny-all-policy bucket, >1000-object prefix), clones the suite, patches
it to path-style addressing, and runs mvn -Dtest=S3CompatApiTest.

The suite also exposed that GetBucketLocation returned 404 NoSuchBucket
for a malformed bucket name; validate the name first and return
400 InvalidBucketName like AWS.

* test: harden snowflake s3compat runner per review

- Pin the upstream suite to a tested commit (SUITE_REV) instead of the
  moving default branch
- Bind the test server to loopback only
- Require the AccessDenied error code when verifying the denied bucket
- Fix README so go install runs in a subshell
- checkout with persist-credentials: false
- Make the concurrency group unique per PR, and widen path filters to
  the storage/operation/wdclient/cluster/pb packages the S3 stack uses

* test: advertise loopback ip for snowflake test server

-ip.bind 127.0.0.1 alone left the volume server advertising the host's
primary address, so chunk uploads were refused. Also set -ip 127.0.0.1
and disable the Iceberg/Lance listeners so the harness is loopback-only
and does not collide with other local services.

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

@@ -0,0 +1,106 @@
+name: "Snowflake S3Compat API tests"
+
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'weed/s3api/**'
+      - 'weed/filer/**'
+      - 'weed/server/**'
+      - 'weed/iam/**'
+      - 'weed/command/**'
+      - 'weed/storage/**'
+      - 'weed/operation/**'
+      - 'weed/wdclient/**'
+      - 'weed/cluster/**'
+      - 'weed/pb/**'
+      - 'test/s3/snowflake/**'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/s3-snowflake-tests.yml'
+  pull_request:
+    branches: [ master ]
+    paths:
+      - 'weed/s3api/**'
+      - 'weed/filer/**'
+      - 'weed/server/**'
+      - 'weed/iam/**'
+      - 'weed/command/**'
+      - 'weed/storage/**'
+      - 'weed/operation/**'
+      - 'weed/wdclient/**'
+      - 'weed/cluster/**'
+      - 'weed/pb/**'
+      - 'test/s3/snowflake/**'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/s3-snowflake-tests.yml'
+
+concurrency:
+  group: ${{ github.event.pull_request.number || github.ref }}/s3-snowflake-tests
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  snowflake-s3compat-tests:
+    name: Snowflake S3Compat API tests
+    runs-on: ubuntu-22.04
+    timeout-minutes: 30
+    env:
+      WORK_DIR: /tmp/seaweedfs-snowflake-tests
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+
+      - name: Set up Go
+        uses: actions/setup-go@v7
+        with:
+          go-version-file: 'go.mod'
+        id: go
+
+      - name: Set up Java
+        uses: actions/setup-java@v6
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Install SeaweedFS
+        run: |
+          cd weed
+          go install -buildvcs=false
+          weed version
+
+      - name: Run Snowflake S3Compat API tests
+        timeout-minutes: 20
+        run: |
+          # Starts weed server, creates the buckets/objects the suite needs,
+          # clones the upstream suite, and runs mvn -Dtest=S3CompatApiTest.
+          bash test/s3/snowflake/run.sh
+
+      - name: Show logs on failure
+        if: failure()
+        run: |
+          echo "=== SeaweedFS Server Log ==="
+          tail -200 "$WORK_DIR/weed.log" || echo "No server log"
+          echo ""
+          echo "=== Surefire results ==="
+          cat "$WORK_DIR"/snowflake-s3compat-api-test-suite/s3compatapi/target/surefire-reports/*.txt 2>/dev/null || echo "No surefire reports"
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: snowflake-s3compat-surefire-reports
+          path: /tmp/seaweedfs-snowflake-tests/snowflake-s3compat-api-test-suite/s3compatapi/target/surefire-reports/
+          retention-days: 14
+
+      - name: Cleanup
+        if: always()
+        run: |
+          pkill -9 -f "weed server" || true
+          rm -rf "$WORK_DIR" || true