doc: add workflows/slo.yml

slo-workload/DEV.md

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+# SLO development guid
+
+### Start local environment
+
+In the [slo-tests](https://github.com/ydb-platform/slo-tests) project in the _playground_ folder
+
+  `run docker compose up -d`
+
+### Check everything in the browserCheck everything in the browser
+
+In the browser, open
+
+* [Grafana](http://localhost:3000/)
+
+* [YDB](http://localhost:8765/)
+
+### Configure local console to run SLO tests
+
+In the [ydb-nodejs-sdk](https://github.com/ydb-platform/ydb-nodejs-sdk) project
+in the slo-workload folder
+
+  `npm i`
+
+  `set YDB_ANONYMOUS_CREDENTIALS=1`
+
+  `set YDB_SSL_ROOT_CERTIFICATES_FILE=../[slo-tests](https://github.com/ydb-platform/slo-tests)/playground/data/ydb_certs/ca.pem`
+
+### Create a test base
+
+  `npx ts-node src/index.ts create grpcs://localhost:2135 local`
+
+### Run the test - for 5 min
+
+  `npx ts-node src/index.ts run grpcs://localhost:2135 local`
+
+### Clean the baseClean the base
+  `npx ts-node src/index.ts clear grpcs://localhost:2135 local`
+
+### What to do in case of test problems
+
+* Restart the environment
+
+  `docker compose down`
+
+  `docker compose up -d`
+
+* Repeat the tests several times. There are floating errors because the tests are integration tests. So the picture may vary from one run to another