fix: simplify CI workflow to resolve linker issues

Remove complex cross-compilation setup that was causing linker
errors. The simplified approach should work with the available
system linkers and musl-tools package.

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

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -96,11 +96,6 @@ jobs:
   integration:
     name: Integration Test
     runs-on: ubuntu-latest
-    services:
-      registry:
-        image: registry:2
-        ports:
-          - 5000:5000
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Install Rust
@@ -111,7 +106,7 @@ jobs:
     - name: Install cross-compilation tools for both architectures
       run: |
         sudo apt-get update
-        sudo apt-get install -y musl-tools gcc-aarch64-linux-gnu gcc-x86-64-linux-gnu
+        sudo apt-get install -y musl-tools gcc-aarch64-linux-gnu
 
     - run: make push-ttl
     - run: make run-built-image