Revert "Add .github/workflows/check-based-on-master (#1991)"

This reverts commit 06cf4e0f70.

This break merge requests to non-master branches - see https://github.com/VictoriaMetrics/VictoriaMetrics/pull/1993#issuecomment-999403963

.github/workflows/check-based-on-master.sh

@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-
-set -x -e
-MASTER_ID=$(git rev-parse "origin/master")
-CURRENT_ID=$(git rev-parse "HEAD")
-BASED_ON_ID=$(git merge-base "$CURRENT_ID" "$MASTER_ID")
-
-if [[ "$MASTER_ID" != "$BASED_ON_ID" ]]
-then
-  echo "Current branch is based on $BASED_ON_ID, which is not the latest \`master\`: $MASTER_ID. Consider \`git rebase origin/master\`."
-  exit 1
-fi

.github/workflows/check-based-on-master.yml

@@ -1,18 +0,0 @@
-name: check-based-on-master
-on:
-  pull_request:
-  push:
-    branches: [ master ]
-jobs:
-  hook:
-    name: Check whether this branch is based on master branch
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check out repo @ current branch
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: 1000 # Hopefully current branch is less than 1000 commits from main
-      - name: Fetch origin/master
-        run: "git fetch origin master"
-      - name: Run check-based-on-master
-        run: .github/workflows/check-based-on-master.sh