Update build-and-push.yml

Remove targets I personally don't need

.github/workflows/build-and-push.yml

@@ -12,19 +12,11 @@ env:
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        platform: [linux/amd64, linux/arm64, linux/arm/v7]
-        target: [x86_64-unknown-linux-musl, aarch64-unknown-linux-musl, armv7-unknown-linux-musleabihf]
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
 
-      - name: Set up QEMU (for cross-platform builds)
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
 
@@ -38,11 +30,10 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
-          platforms: ${{ matrix.platform }}
+          platforms: linux/amd64
           push: true
           tags: |
             ${{ env.REGISTRY_IMAGE }}:latest
             ${{ env.REGISTRY_IMAGE }}:${{ github.sha }}
-            ${{ env.REGISTRY_IMAGE }}:${{ matrix.target }}
           build-args: |
-            TARGET=${{ matrix.target }}
+            TARGET=x86_64-unknown-linux-musl