[OSDC] Update docker build runners (#7943)

Fix runner prefix

Author: atalman

.github/actionlint.yaml

@@ -12,5 +12,5 @@ self-hosted-runner:
     # Below are OSDC ARC runner
     - mt-l-x86iamx-8-16
     - mt-l-arm64g2-6-32
-    - rel-l-x86iavx512-8-64
-    - rel-l-arm64g4-16-62
+    - mt-rel-l-x86iavx512-8-64
+    - mt-rel-l-arm64g4-16-62

.github/workflows/_docker-build.yml

@@ -20,29 +20,29 @@ jobs:
       matrix:
         include:
           # --- CPU ---
-          - runner: rel-l-x86iavx512-8-64
+          - runner: mt-rel-l-x86iavx512-8-64
             platform: linux/amd64
             base_image: quay.io/pypa/manylinux_2_28_x86_64
             install_cuda: ""
             variant_tag: cpu-x86_64
             buildkit_addr: tcp://buildkitd-amd64.buildkit:1234
             dockerfile: Dockerfile
-          - runner: rel-l-arm64g4-16-62
+          - runner: mt-rel-l-arm64g4-16-62
             platform: linux/arm64
             base_image: quay.io/pypa/manylinux_2_28_aarch64
             install_cuda: ""
             variant_tag: cpu-aarch64
             buildkit_addr: tcp://buildkitd-arm64.buildkit:1234
             dockerfile: Dockerfile.aarch64
           # --- CUDA (all versions in one image, self-hosted DinD runners) ---
-          - runner: rel-l-x86iavx512-8-64
+          - runner: mt-rel-l-x86iavx512-8-64
             platform: linux/amd64
             base_image: quay.io/pypa/manylinux_2_28_x86_64
             install_cuda: "1"
             variant_tag: cuda-x86_64
             buildkit_addr: tcp://buildkitd-amd64.buildkit:1234
             dockerfile: Dockerfile
-          - runner: rel-l-arm64g4-16-62
+          - runner: mt-rel-l-arm64g4-16-62
             platform: linux/arm64
             base_image: quay.io/pypa/manylinux_2_28_aarch64
             install_cuda: "1"