ci(linux-install-tests): use rockylinux/rockylinux images and add Rocky Linux 10 (#1761)

The `rockylinux:N` Docker Hub short names are deprecated and don't
publish v10 tags. Switch to the official `rockylinux/rockylinux` images
and expand RPM test coverage to include Rocky Linux 10.

- **Image source**: `rockylinux:8` / `rockylinux:9` →
`rockylinux/rockylinux:8` / `rockylinux/rockylinux:9`
- **Matrix expansion**: Added `rockylinux/rockylinux:10` entry
- **Comments**: Updated header docs to reflect v8/v9/v10 coverage

No changes to `smoke-test-rpm.sh` — Rocky 10 ships `dnf` compatibility,
same base packages, and glibc 2.39+ (well above the 2.27 floor).

Co-authored-by: CBenoit <3809077+CBenoit@users.noreply.github.com>

Author: Copilot

.github/workflows/linux-install-test.yml

@@ -13,7 +13,7 @@ name: Linux Install Tests
 #   - Runs package installation tests inside Docker containers on
 #     GitHub-hosted runners (x86_64 only).
 #   - DEB lane: Ubuntu 18.04, 20.04, 22.04, 24.04 containers.
-#   - RPM lane: Rocky Linux 8, 9 containers (RHEL-compatible).
+#   - RPM lane: Rocky Linux 8, 9, 10 containers (RHEL-compatible).
 #   - Tests are split into:
 #       1. Mandatory package smoke tests (must pass).
 #       2. Best-effort systemd service tests (informational only).
@@ -25,7 +25,7 @@ name: Linux Install Tests
 #     infrastructure required.
 #   - Container-based: Close enough to real distros for catching packaging
 #     regressions, though not a perfect replica of production systems.
-#   - Rocky Linux (8, 9): Free, widely-used RHEL-compatible rebuilds.
+#   - Rocky Linux (8, 9, 10): Free, widely-used RHEL-compatible rebuilds.
 #   - x86_64 only: GitHub-hosted runners are x86_64; ARM64 packages would
 #     require QEMU or ARM runners, not worth the complexity for v1.
 #   - Service testing is best-effort: systemd inside Docker containers is
@@ -165,15 +165,20 @@ jobs:
             container-image: "ubuntu:24.04"
             test-script: ".github/scripts/smoke-test-deb.sh"
             package-pattern: "*.deb"
-          # RPM lane: Rocky Linux 8, 9 (RHEL-compatible)
+          # RPM lane: Rocky Linux 8, 9, 10 (RHEL-compatible)
           - package-type: rpm
             display-name: "RPM Install Test (Rocky Linux 8)"
-            container-image: "rockylinux:8"
+            container-image: "rockylinux/rockylinux:8"
             test-script: ".github/scripts/smoke-test-rpm.sh"
             package-pattern: "*.rpm"
           - package-type: rpm
             display-name: "RPM Install Test (Rocky Linux 9)"
-            container-image: "rockylinux:9"
+            container-image: "rockylinux/rockylinux:9"
+            test-script: ".github/scripts/smoke-test-rpm.sh"
+            package-pattern: "*.rpm"
+          - package-type: rpm
+            display-name: "RPM Install Test (Rocky Linux 10)"
+            container-image: "rockylinux/rockylinux:10"
             test-script: ".github/scripts/smoke-test-rpm.sh"
             package-pattern: "*.rpm"