fix: enable Docker Buildx to eliminate legacy builder deprecation warnings

Adds Docker Buildx setup to test.yml and trivy.yml workflows to resolve
deprecation warnings and align with production workflows.

Changes:
- test.yml: Add docker/setup-buildx-action@v3 after macOS Docker setup
- trivy.yml: Add docker/setup-buildx-action@v3 before image builds

Benefits:
- Removes "The legacy builder is deprecated" warnings from all workflows
- Aligns with production workflows (create-release.yml, build-qa-docker.yml)
- Enables BuildKit for faster builds and better caching
- No changes required to existing docker build commands
- Future-proofs workflows before legacy builder removal

All workflows now use consistent Docker build approach:
✅ create-release.yml - Already using Buildx
✅ build-qa-docker.yml - Already using Buildx
✅ test.yml - Now using Buildx (this PR)
✅ trivy.yml - Now using Buildx (this PR)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jnewton03

.github/workflows/test.yml

@@ -36,7 +36,10 @@ jobs:
       - name: Setup Docker on macOS
         if: matrix.os == 'macos-15-intel'
         uses: douglascamata/[email protected]
-            
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build an image from ${{ matrix.dockerfile }}
         run: |
           docker build -f ${{ matrix.dockerfile }} -t liquibase/liquibase:${{ github.sha }} .

.github/workflows/trivy.yml

@@ -52,6 +52,9 @@ jobs:
             ,/vault/liquibase
           parse-json-secrets: true
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build ${{ matrix.image.name }}${{ matrix.image.suffix }} from Dockerfile
         run: |
           docker build -f ${{ matrix.image.dockerfile }} -t ${{ matrix.image.name }}${{ matrix.image.suffix }}:${{ github.sha }} .