docs: update signing in latests & all commit

Author: ddevsr

contributing/workflow.md

@@ -183,12 +183,20 @@ Just make sure that your commits in a feature branch are all related.
 
 Almost developer forgot signing GPG with params `-S` in commiting like `git commit -S -m "Signed GPG"`, you can signing old commit to keep secure.
 
+Latests commit :
 ```console
 > git switch your-branch
 > git commit --amend --no-edit -n -S
 > git push --force-with-lease origin your-branch
 ```
 
+All commit (will be change date commit to today) :
+```console
+> git switch your-branch
+> git rebase -i --root --exec 'git commit --amend --no-edit -n -S'
+> git push --force-with-lease origin your-branch
+```
+
 But developer can secure commit without `-S` in `git commit`, you can set `git config --global commit.gpgsign true` and `git config --global user.signingkey 3AC5C34371567BD2` to all local repostory local or without `--global` to one local repostory.
 
 > **Note**