gha add git config

Author: l-trotta

.github/workflows/release_central.yml

@@ -29,6 +29,8 @@ env:
   VERSION: ${{ inputs.version }}
   PREV_VERSION: ${{ inputs.prev_version }}
   DRY_RUN: ${{ inputs.dry_run }}
+  GIT_USER: 'Laura Trotta'
+  GIT_MAIL: laura.trotta@elastic.co
 
 jobs:
   validate-version:
@@ -86,6 +88,8 @@ jobs:
 
       - run: |
             cd elasticsearch-java
+            git config user.name "$GIT_USER"
+            git config user.email "$GIT_MAIL"
             git tag v${{ inputs.version }}
             git push origin v${{ inputs.version }}
             echo ${{ inputs.version }} > config/version.txt