build: smoke test on RHEL8 instead of RHEL7 (#25421)

.github/workflows/build.yml

@@ -342,21 +342,24 @@ jobs:
             docker.io/hashicorppreview/${{ env.PKG_NAME }}:${{ env.version }}-${{env.revision}}
 
   minimum-os:
+    # test glibc 2.28 compatibility (RHEL 8.10)
     name: OS Compatibility
-    # A quick smoke test of our binaries on our minimum target OS (RHEL 7). Why RHEL 7? Because the glibc version is that old (2.17).
     needs:
       - get-go-version
       - get-product-version
       - build-linux
-    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
-      # Note: Ideally we'd test all our target archs, unfortunately availability of containers of these OS's vary.
-      # For instance there is no ubi7 image for arm64 (there is on ubi8), RHBZ#1728771. And none at all for arm.
-      # So we have to settle for only being able to validate where we can, which is just amd64.
       matrix:
         goos: [linux]
-        goarch: [amd64]
+        goarch: [amd64, arm64]
+        runner: [ubuntu-22.04, ubuntu-22.04-arm]
+        exclude:
+          - runner: ubuntu-22.04
+            goarch: arm64
+          - runner: ubuntu-22.04-arm
+            goarch: amd64
+    runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/setup-go@f111f3307d8850f501ac008e886eec1fd1932a34 # v5.3.0
         with:
@@ -369,7 +372,6 @@ jobs:
           artifact_name: ${{ env.PKG_NAME }}_${{ needs.get-product-version.outputs.product-version }}_${{ matrix.goos }}_${{ matrix.goarch }}.zip
         run: |
           echo "::group::Unpack and Prep"
-          docker pull registry.access.redhat.com/ubi7/ubi-minimal:7.9-1057
           unzip "$artifact_name"
           echo "::group::Diagnostics"
           echo "CGO related build information:"
@@ -377,7 +379,7 @@ jobs:
           echo "GLIBC links:"
           go tool nm ./nomad | grep -i glibc | cut -d @ -f 2-3 | sort --version-sort | uniq
           echo "::group::Smoke test binary"
-          docker run --rm -v "$PWD:/src" registry.access.redhat.com/ubi7/ubi-minimal:7.9-1057 /src/nomad version
+          docker run --rm -v "$PWD:/src" redhat/ubi8:8.10 /src/nomad version
 
   handle-failure:
     needs: