docker: enable telemetry via environment variable

Author: dalpasso

docker/run-stac-server.sh

@@ -1,11 +1,15 @@
 #!/bin/bash
 # some pre-start operation
 LOGGING_OPTIONS=""
+SERVE_REST_OPTIONS=""
 re='^[0-9]+$'
 if [[ ${EODAG_LOGGING} =~ $re ]] && [ "${EODAG_LOGGING} " -gt "0" ]; then
    LOGGING_OPTIONS="-"$(printf '%0.sv' $(seq 1 ${EODAG_LOGGING}))
 else
     echo "Logging level can be changed using EODAG_LOGGING environment variable [1-3]"
 fi
+if [[ -n "${OTEL_EXPORTER_OTLP_ENDPOINT}" ]]; then
+    SERVE_REST_OPTIONS="--observability"
+fi
 # start
-exec eodag $LOGGING_OPTIONS serve-rest -w
+exec eodag $LOGGING_OPTIONS serve-rest -w $SERVE_REST_OPTIONS