[DVC-6429] [chore] add gitstream

.cm/gitstream.cm

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+# -*- mode: yaml -*-
+
+manifest:
+  version: 1.0
+
+# The `automations` section includes a list of automation that applies 
+# to the repository in which gitStream is installed. Each automation has an 
+# `if` key with a list of the necessary assertions, as well as a `run` key with a
+# list of all actions. All the listed assertions need to pass in order 
+# for the following actions to be executed (there is AND relation between conditions).
+
+# Each automation under the `automations` section is independent of the others. 
+# Every time a PR is opened or changed, the automation's conditions are evaluated (the `if`). 
+# The actions under `run` are executed one by one if all the conditions pass. 
+
+# Conditions consists of an expression, which are wrapped with double curly braces, and 
+# includes a context variable like `files` and filter functions like `length`. Filters 
+# functions are essentially functions that can be applied to context variables. They are 
+# called with a pipe operator (|) and can take arguments. Read more on https://docs.gitstream.cm
+
+config:
+    ignore_files:
+        - 'yarn.lock'
+        - 'migrations.json'
+
+automations:
+  # This is the name of the review automation. You can use whatever name, a meaningful name 
+  # will help to identify it in the future. Each automation name in this file should be unique.
+  estimated_time_to_review:
+    if:
+      - true
+    run:
+      - action: add-label@v1
+        args:
+          label: "{{ calc.etr }} min review"
+          color: {{ 'E94637' if (calc.etr >= 20) else ('FBBD10' if (calc.etr >= 5) else '36A853') }}
+
+  safe_changes:
+    # The `if` key has a list of conditions, each condition is specified as a Jinja expression
+    # in a double curly braces. Expressions are evaluated by gitStream on a PR when triggered.
+    if:
+      # Given the PR code changes, check that only formatting changes were made 
+      - {{ is.formatting or is.docs or is.tests }}
+    # `run` key has a list of actions, which are executed one by one whenever the automation 
+    # conditions are met. 
+    run: 
+      # When the changes are validated as formatting only, you can help to speed up the review 
+      # by adding a label that marks it accordingly.
+      - action: add-label@v1
+        args:
+          label: 'safe-changes'
+      # You can uncomment the following action to get gitStream can even automatically approve 
+      # such PRs to save reviewers time for such changes.
+      # - action: approve@v1
+
+
+calc:
+  etr: {{ branch | estimatedReviewTime }}
+is:
+  formatting: {{ source.diff.files | isFormattingChange }}
+  docs: {{ files | allDocs }}
+  tests: {{ files | allTests }}

.github/workflows/gitstream.yml

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+# Code generated by gitStream GitHub app - DO NOT EDIT
+
+name: gitStream workflow automation
+
+on:
+  workflow_dispatch:
+    inputs:
+      client_payload:
+          description: The Client payload
+          required: true
+      full_repository:
+          description: the repository name include the owner in `owner/repo_name` format
+          required: true
+      head_ref:
+          description: the head sha
+          required: true
+      base_ref:
+          description: the base ref 
+          required: true
+      installation_id:
+          description: the installation id
+          required: false
+      resolver_url:
+          description: the resolver url to pass results to
+          required: true
+      resolver_token:
+          description: Optional resolver token for resolver service
+          required: false
+          default: ''
+
+jobs:
+  gitStream:
+    timeout-minutes: 5
+    # uncomment this condition, if you dont want any automation on dependabot PRs
+    # if: github.actor != 'dependabot[bot]'
+    runs-on: ubuntu-latest
+    name: gitStream workflow automation
+    steps:
+      - name: Evaluate Rules
+        uses: linear-b/gitstream-github-action@v1
+        id: rules-engine
+        with:
+          full_repository: ${{ github.event.inputs.full_repository }}
+          head_ref: ${{ github.event.inputs.head_ref }}
+          base_ref: ${{ github.event.inputs.base_ref }}
+          client_payload: ${{ github.event.inputs.client_payload }}
+          installation_id: ${{ github.event.inputs.installation_id }}
+          resolver_url: ${{ github.event.inputs.resolver_url }}
+          resolver_token: ${{ github.event.inputs.resolver_token }}