Update example workflows to use docker-container driver

Replace the legacy TCP endpoint with docker-container://buildcage
to match the README and the driver migration in #24.

Author: dash14

.github/workflows/example-audit.yml

@@ -11,7 +11,6 @@ jobs:
 
     steps:
       - name: Start Buildcage builder
-        id: buildcage
         uses: dash14/buildcage/setup@v1
         with:
           proxy_mode: audit
@@ -20,7 +19,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
         with:
           driver: remote
-          endpoint: tcp://localhost:${{ steps.buildcage.outputs.port }}
+          endpoint: docker-container://buildcage
 
       - name: Create test Dockerfile
         run: |

.github/workflows/example-restrict.yml

@@ -11,7 +11,6 @@ jobs:
 
     steps:
       - name: Start Buildcage builder
-        id: buildcage
         uses: dash14/buildcage/setup@v1
         with:
           proxy_mode: restrict
@@ -23,7 +22,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
         with:
           driver: remote
-          endpoint: tcp://localhost:${{ steps.buildcage.outputs.port }}
+          endpoint: docker-container://buildcage
 
       - name: Create test Dockerfile
         run: |