merge: bring the CI fixes forward from phase8-log-correlation

One conflicted file, docs/telemetry-runbook.md, with three spots:

- Build section: both sides added different text at one point. Kept both,
  incoming sentence first, then this branch's "Run against a live network".
- Disabling section, first spot: this branch's wording names the config
  section and says no rebuild is needed, so it already covers the incoming
  sentence.
- Disabling section, second spot: kept this branch's paragraph and folded in
  the one point it lacked, that both flags have to be passed.

.github/scripts/strategy-matrix/linux.json

@@ -74,7 +74,7 @@
         "extra_cmake_args": "-Dvalidator_keys=ON",
         "package": {
           "type": "deb",
-          "image": "ghcr.io/xrplf/xrpld/packaging-debian:sha-b6a8995"
+          "image": "ghcr.io/xrplf/xrpld/packaging-debian:sha-49cdc10"
         }
       }
     ],
@@ -88,7 +88,7 @@
         "extra_cmake_args": "-Dvalidator_keys=ON",
         "package": {
           "type": "rpm",
-          "image": "ghcr.io/xrplf/xrpld/packaging-rhel:sha-b6a8995"
+          "image": "ghcr.io/xrplf/xrpld/packaging-rhel:sha-49cdc10"
         }
       }
     ]