Fix docker build workflow

Author: mxsrc

.github/workflows/docker-image.yaml

@@ -10,6 +10,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
     - name: Configure AWS Credentials
       uses: aws-actions/configure-aws-credentials@v2
       with:
@@ -24,8 +27,7 @@ jobs:
     - name: Build and publish image
       uses: docker/build-push-action@v6
       with:
-        context: "{defaultContext}:aws"
-        file: docker/Dockerfile
+        context: "{{defaultContext}}:aws"
         push: true
         tags: ${{ steps.login-ecr.outputs.registry }}/simplyblockdeploy:latest
         cache-from: type=gha