Add INDEXED_SEARCH_INDEXER to sourcegraph-frontend-internal service envs

[loujar]

Add INDEXED_SEARCH_INDEXER to sourcegraph-frontend-internal service ENVs. Follow up to #1208

Checklist

• Sister deploy-sourcegraph change:
• Sister customer-replica change (if necessary, for any changes affecting pure-docker or configuration):
• All images have a valid tag and SHA256 sum

Test plan

CI

[marcleblanc2]

Bump to retry buildkite

[sourcegraph-release-bot]

The backport to 6.2.x failed at https://github.com/sourcegraph/deploy-sourcegraph-docker/actions/runs/15072927888:

The process '/usr/bin/git' failed with exit code 1

To backport this PR manually, you can either:

Via the sg tool

Use the sg backport command to backport your commit to the release branch.

sg backport -r 6.2.x -p 1209

Via your terminal

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-6.2.x 6.2.x
# Navigate to the new working tree
cd .worktrees/backport-6.2.x
# Create a new branch
git switch --create backport-1209-to-6.2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 782c470fcecea6184033930ec29bd3ebe28066c0
# Push it to GitHub
git push --set-upstream origin backport-1209-to-6.2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-6.2.x

If you encouter conflict, first resolve the conflict and stage all files, then run the commands below:

git cherry-pick --continue
# Push it to GitHub
git push --set-upstream origin backport-1209-to-6.2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-6.2.x

• Follow above instructions to backport the commit.
• Create a pull request where the base branch is 6.2.x and the compare/head branch is backport-1209-to-6.2.x., click here to create the pull request.

Once the pull request has been created, please ensure the following:

• Make sure to tag @sourcegraph/release in the pull request description.

• kindly remove the release-blocker from this pull request.

[sourcegraph-release-bot]

The backport to 6.3.x failed at https://github.com/sourcegraph/deploy-sourcegraph-docker/actions/runs/15072927888:

The process '/usr/bin/git' failed with exit code 1

To backport this PR manually, you can either:

Via the sg tool

Use the sg backport command to backport your commit to the release branch.

sg backport -r 6.3.x -p 1209

Via your terminal

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-6.3.x 6.3.x
# Navigate to the new working tree
cd .worktrees/backport-6.3.x
# Create a new branch
git switch --create backport-1209-to-6.3.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 782c470fcecea6184033930ec29bd3ebe28066c0
# Push it to GitHub
git push --set-upstream origin backport-1209-to-6.3.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-6.3.x

If you encouter conflict, first resolve the conflict and stage all files, then run the commands below:

git cherry-pick --continue
# Push it to GitHub
git push --set-upstream origin backport-1209-to-6.3.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-6.3.x

• Follow above instructions to backport the commit.
• Create a pull request where the base branch is 6.3.x and the compare/head branch is backport-1209-to-6.3.x., click here to create the pull request.

Once the pull request has been created, please ensure the following:

• Make sure to tag @sourcegraph/release in the pull request description.

• kindly remove the release-blocker from this pull request.