ci: update Nginx benchmarks to 1.26.0 (#87)

Author: ddyurchenko

.gitlab/benchmarks.yml

@@ -6,9 +6,7 @@ variables:
   tags: ["runner:apm-k8s-same-cpu"]
   timeout: 1h
   rules:
-    - if: $CI_COMMIT_REF_NAME == "master"
-      when: always
-    - if: $CI_PIPELINE_SOURCE == "schedule"
+    - if: $NIGHTLY_BENCHMARKS || $CI_COMMIT_REF_NAME == "master"
       when: always
     - when: manual
   image: $BASE_CI_IMAGE
@@ -26,17 +24,17 @@ variables:
     DD_TRACE_DEBUG: "false"
     DD_RUNTIME_METRICS_ENABLED: "true"
 
-    DD_BENCHMARKS_NGINX_IMAGE_TAG: nginx_1.18.0
+    DD_BENCHMARKS_NGINX_IMAGE_TAG: amd64-1.26.0
 
     K6_OPTIONS_NORMAL_OPERATION_RATE: 1000
-    K6_OPTIONS_NORMAL_OPERATION_DURATION: 20m
-    K6_OPTIONS_NORMAL_OPERATION_GRACEFUL_STOP: 1m
+    K6_OPTIONS_NORMAL_OPERATION_DURATION: 5m
+    K6_OPTIONS_NORMAL_OPERATION_GRACEFUL_STOP: 10s
     K6_OPTIONS_NORMAL_OPERATION_PRE_ALLOCATED_VUS: 4
     K6_OPTIONS_NORMAL_OPERATION_MAX_VUS: 4
 
     K6_OPTIONS_HIGH_LOAD_RATE: 5000
-    K6_OPTIONS_HIGH_LOAD_DURATION: 10m
-    K6_OPTIONS_HIGH_LOAD_GRACEFUL_STOP: 30s
+    K6_OPTIONS_HIGH_LOAD_DURATION: 2m
+    K6_OPTIONS_HIGH_LOAD_GRACEFUL_STOP: 10s
     K6_OPTIONS_HIGH_LOAD_PRE_ALLOCATED_VUS: 4
     K6_OPTIONS_HIGH_LOAD_MAX_VUS: 4