fix(start): enable persistent storage mode when --persist is set (#9)

The server defaults to FLOCI_STORAGE_MODE=memory, so the --persist
bind mount to /app/data was a no-op: state was never written to disk
and did not survive a container restart.

Set FLOCI_STORAGE_MODE=persistent (per-cloud prefixed variant for GCP
and Azure) whenever --persist is provided, so emulator state is written
to the mounted host directory and survives restarts. Verified
end-to-end with S3 and DynamoDB across a stop --remove + start cycle.

Author: hectorvent

src/main/java/io/floci/cli/commands/StartCommand.java

@@ -84,6 +84,9 @@ public Integer call() {
         args.addAll(DockerClient.dockerSocketRunArgs());
         if (persistDir != null) {
             args.addAll(List.of("-v", persistDir + ":/app/data"));
+            // The server defaults to in-memory storage; enable persistent mode so
+            // state is actually written to the mounted directory and survives restarts.
+            args.addAll(List.of("-e", "FLOCI_STORAGE_MODE=persistent"));
         }
         if (services != null && !services.isBlank()) {
             args.addAll(List.of("-e", "FLOCI_SERVICES=" + services));

src/main/java/io/floci/cli/commands/az/AzStartCommand.java

@@ -79,6 +79,9 @@ public Integer call() {
         args.addAll(DockerClient.dockerSocketRunArgs());
         if (persistDir != null) {
             args.addAll(List.of("-v", persistDir + ":/app/data"));
+            // The server defaults to in-memory storage; enable persistent mode so
+            // state is actually written to the mounted directory and survives restarts.
+            args.addAll(List.of("-e", "FLOCI_AZ_STORAGE_MODE=persistent"));
         }
         if (services != null && !services.isBlank()) {
             args.addAll(List.of("-e", "FLOCI_AZ_SERVICES=" + services));

src/main/java/io/floci/cli/commands/gcp/GcpStartCommand.java

@@ -79,6 +79,9 @@ public Integer call() {
         args.addAll(DockerClient.dockerSocketRunArgs());
         if (persistDir != null) {
             args.addAll(List.of("-v", persistDir + ":/app/data"));
+            // The server defaults to in-memory storage; enable persistent mode so
+            // state is actually written to the mounted directory and survives restarts.
+            args.addAll(List.of("-e", "FLOCI_GCP_STORAGE_MODE=persistent"));
         }
         if (services != null && !services.isBlank()) {
             args.addAll(List.of("-e", "FLOCI_GCP_SERVICES=" + services));