fix(cmd bench-omni): build omni-bencher with production profile (#7299)

# Description

This PR builds frame-omni-bencher with `production` profile when calling
`/cmd bench-omni` to compute benchmarks for pallets.
Fix proposed by @bkchr , thanks!

Closes #6797.

## Integration

N/A

## Review Notes

More info on #6797, and related to how the fix was tested:
#6797 (comment).

---------

Signed-off-by: Iulian Barbu <iulian.barbu@parity.io>
Co-authored-by: command-bot <>

Author: iulianbarbu

.github/workflows/cmd.yml

@@ -348,7 +348,7 @@ jobs:
       - name: Install dependencies for bench
         if: startsWith(needs.get-pr-info.outputs.CMD, 'bench')
         run: |
-          cargo install --path substrate/utils/frame/omni-bencher --locked
+          cargo install --path substrate/utils/frame/omni-bencher --locked --profile production
 
       - name: Run cmd
         id: cmd