use lowercase for env names even if branch name consist uppercase symbols (#1548)

Co-authored-by: Azat Safin <azsafin@provectus.com>

.github/workflows/branch-deploy.yml

@@ -17,7 +17,7 @@ jobs:
           branch_name=$(hub branch | grep "*" | sed -e 's/^\*//')
           echo $branch_name
           echo ::set-output name=branch::${branch_name}
-          tag=$(echo $branch_name |  sed 's/\//-/g' | sed 's/\./-/g' | sed 's/\_/-/g' |  cut -c1-32)
+          tag=$(echo $branch_name |  sed 's/\//-/g' | sed 's/\./-/g' | sed 's/\_/-/g' |  sed -e 's/\(.*\)/\L\1/' | cut -c1-32)
           echo ::set-output name=tag::${tag}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}