fix: update branch name format and improve reviewer assignment in bump workflow

Author: MishaKav

.github/workflows/bump-gitstream-core.yml

@@ -31,11 +31,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          token: ${{ secrets.CI_USER_GIT_TOKEN }}
 
       - name: Set version to ENV
         run: |
           echo "VERSION=${{ inputs.version }}" >> "$GITHUB_ENV"
-          echo "BRANCH_NAME=${{ inputs.ticket }}-bump-gitstream-core-to-${{ inputs.version }}" >> "$GITHUB_ENV"
+          echo "BRANCH_NAME=bump-gitstream-core-to-${{ inputs.version }}" >> "$GITHUB_ENV"
           echo "LABEL_ARG=" >> "$GITHUB_ENV"
           echo "REVIEWER_ARG=" >> "$GITHUB_ENV"
 
@@ -45,9 +47,9 @@ jobs:
           echo "LABEL_ARG=--label auto-deploy" >> "$GITHUB_ENV"
 
       - name: Set reviewer
-        if: inputs.reviewer
         run: |
-          echo "REVIEWER_ARG=--reviewer ${{ inputs.reviewer }}" >> "$GITHUB_ENV"
+          REVIEWER="${{ inputs.reviewer || github.actor }}"
+          echo "REVIEWER_ARG=--reviewer $REVIEWER" >> "$GITHUB_ENV"
 
       - name: Init npmrc
         run: |
@@ -62,7 +64,7 @@ jobs:
       - name: Create PR for ${{ env.VERSION }}
         id: create-pr
         env:
-          GH_TOKEN: ${{ github.token }}
+          GH_TOKEN: ${{ secrets.CI_USER_GIT_TOKEN }}
         run: |
           echo -e "${{ inputs.description }}" > pr_description.txt
           git config --global user.name 'GitHub Actions Bot'