feat(TMP-1717): Add PR validation check

.circleci/check-pr-branch.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+current_branch=$(git branch --show-current)
+merge_base=$(git merge-base $current_branch master)
+recommend_rebase="rebase your branch on the master branch."
+
+# checking if PR branch is up to date
+if ! git diff -s --exit-code $current_branch...master ; then
+  echo "Branch ${current_branch} is not up-to-date with master. Please, ${recommend_rebase}"
+  exit 1
+fi
+
+# checking if there is no new merge commit
+current_commit=$(git show-ref --heads -s $current_branch)
+for commit in $(git log $current_commit...$merge_base --format="%h"); do
+  parent_count=$(git cat-file -p $commit | grep parent | wc -l)
+  if [ "${parent_count}" != 1 ]; then
+    commit_msg=$(git log $commit -1 --format="%s")
+    echo "Merge commits like ${commit} (${commit_msg}) are not allowed. Please ${recommend_rebase}"
+    exit 1
+  fi
+done

.circleci/config.yml

@@ -57,6 +57,14 @@ jobs:
           paths:
             - ./
 
+  check-pr-branch:
+    executor: node
+    steps:
+      - checkout
+      - run:
+          name: "Check if PR is up-to-date and there are no merge commits"
+          command: ./.circleci/check-pr-branch.sh
+
   run_lint:
     executor: node
     steps:
@@ -285,27 +293,34 @@ workflows:
   run_tests:
     jobs:
       - setup
+      - check-pr-branch:
+          <<: *only_on_pr_branch
       - run_lint:
           requires:
             - setup
+            - check-pr-branch
       - build_storybook:
           requires:
             - setup
+            - check-pr-branch
       - run_noplatform_tests:
           requires:
             - setup
+            - check-pr-branch
       - run_web_tests:
           requires:
             - setup
+            - check-pr-branch
       - run_unit_tests:
           requires:
             - setup
+            - check-pr-branch
       - sonarcloud_scan:
           context: SonarCloud
       - run_cypress_tests:
           requires:
             - setup
-
+            - check-pr-branch
       - verdaccio-test-approval:
           <<: *only_on_master_branch
           type: approval