workflows: remove explicit amd64 arch

Remove the explicit arch parameter from include in build-server and
test-server job definition.

Signed-off-by: Alexander Bachmann <a.t.bachmann@gmail.com>

Author: abachmann

.github/workflows/container-image.yml

@@ -53,7 +53,6 @@ jobs:
         include:
           - package_source: devbuilds
             os: centos
-            arch: amd64
     runs-on: ubuntu-latest
     env:
       BUILDAH_FORMAT: oci
@@ -182,7 +181,6 @@ jobs:
         include:
           - package_source: devbuilds
             os: centos
-            arch: amd64
     needs: build-server
     runs-on: ubuntu-latest
     env: