Revert "Build Docker image for ARM" (#4)

Reverts #2

ARM builds increases the build time from 5 minutes to almost an hour.
We don't have any ARM machines in the on-prem cluster. We can reapply
this in the future if needed.

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

@@ -37,9 +37,6 @@ jobs:
           username: ${{ env.REGISTRY_USER }}
           password: ${{ env.REGISTRY_PASSWORD }}
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@988b5a0280414f521da01fcc63a27aeeb4b104db
-
       - name: Build packager
         uses: docker/build-push-action@91df6b874e498451163feb47610c87c4a218c1ee
         with:
@@ -79,7 +76,7 @@ jobs:
         with:
           context: .
           target: slurmctld
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64
           push: true
           build-args: |
             DOCKER_METADATA_OUTPUT_JSON
@@ -105,7 +102,7 @@ jobs:
         with:
           context: .
           target: slurmdbd
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64
           push: true
           build-args: |
             DOCKER_METADATA_OUTPUT_JSON