Remove arm64 build, simplify for x86_64 only

.github/workflows/build-opencode-cli-docker.yml

@@ -35,9 +35,6 @@ jobs:
           - arch: amd64
             runner: ubuntu-24.04
             cli_dir: opencode-linux-x64
-          - arch: arm64
-            runner: ubuntu-24.04-arm64
-            cli_dir: opencode-linux-arm64
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -51,21 +48,6 @@ jobs:
         run: bun install
         working-directory: opencode
 
-      - name: Debug - Check directory structure
-        run: |
-          pwd
-          ls -la
-          ls -la packages/opencode/
-        working-directory: opencode
-        
-      - name: Debug - Test bun script execution
-        run: |
-          echo "Testing bun..."
-          bun --version
-          echo "Testing script import..."
-          bun run -e "try { const { Script } = await import('@opencode-ai/script'); console.log('Script imported:', Script.version); } catch(e) { console.error('Import failed:', e); process.exit(1); }"
-        working-directory: opencode
-
       - name: Build CLI
         run: bun run ./packages/opencode/script/build.ts --single
         working-directory: opencode
@@ -94,9 +76,6 @@ jobs:
           path: opencode/packages/opencode/dist
           merge-multiple: true
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
         with:
@@ -120,11 +99,11 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build image (multi-arch push)
+      - name: Build image (amd64 push)
         if: ${{ env.PUSH_IMAGE == 'true' }}
         run: |
           docker buildx build \
-            --platform linux/amd64,linux/arm64 \
+            --platform linux/amd64 \
             --cache-from type=local,src=/tmp/.buildx-cache \
             --cache-to type=local,dest=/tmp/.buildx-cache-new,mode=max \
             -t "$IMAGE_NAME" \