Allow mounting a volume to host the config and enable read only root … #1604

Job	Run time
Build Reaper	7m 26s
Docker Image Tests (cassandra, docker)	7m 48s
Memory backends (binary:3.0.25, local, ccm)	18m 1s
Cassandra backend (binary:3.0.25, cassandra, ccm)	18m 21s
HTTP Management (binary:4.0.6, ccm, http-api, 1, 1)	25m 3s
Memory backends (binary:3.11.16, local, ccm)	19m 0s
Cassandra backend (binary:3.11.16, cassandra, ccm)	21m 33s
HTTP Management (binary:3.11.16, ccm, http-api, 1, 1)	21m 50s
Memory backends (binary:4.0.6, local, ccm)	21m 31s
Cassandra backend (binary:4.0.6, cassandra, ccm)	22m 32s
Flapping reapers (binary:4.0.6, cassandra, ccm, 4, 2, --tags ~@diag_event_subscriptions)	23m 18s
Sidecar (binary:3.0.25, cassandra, sidecar, 1, 1)	15m 33s
Each DC Availability (binary:4.0.6, cassandra, each, 1, 1)	18m 59s
Distributed tests (binary:3.0.25, cassandra, ccm, 2, 2)	19m 53s
Sidecar (binary:3.11.16, cassandra, sidecar, 1, 1)	16m 49s
Distributed tests (binary:3.11.16, cassandra, ccm, 2, 2)	21m 26s
Sidecar (binary:4.0.6, cassandra, sidecar, 1, 1)	16m 47s
Distributed tests (binary:4.0.6, cassandra, ccm, 2, 2)	24m 39s
Release Reaper	5m 51s
	5h 46m 20s

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