fix: Correct GO_VERSION build arg in release workflow

Author: sheurich

.github/workflows/release.yml

@@ -27,6 +27,7 @@ jobs:
       packages: write
     outputs:
       version: ${{ steps.version.outputs.version }}
+      go_version: ${{ matrix.GO_VERSION }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -167,7 +168,7 @@ jobs:
         run: |
           VERSION="${{ needs.build-artifacts.outputs.version }}"
           docker buildx build . \
-            --build-arg "GO_VERSION=${{ needs.build-artifacts.outputs.version }}" \
+            --build-arg "GO_VERSION=${{ needs.build-artifacts.outputs.go_version }}" \
             -f test/ct-test-srv/Dockerfile \
             --platform linux/amd64,linux/arm64 \
             -t "ghcr.io/${{ github.repository_owner }}/ct-test-srv:${{ github.ref_name }}-go${VERSION}" \