fix(appliance): Make Appliance URL envvars strings

[Chickensoupwithrice]

Changes APPLIANCE_MANAGED -> APPLIANCE_UPDATE_TARGET, and creates APPLIANCE_MENU_TARGET. Both are stringly typed env vars, that when set will create / redirect the update buttons / menu links in the site admin and nav item pages.

Paired with @nelsonjr and @DaedalusG on this

Test plan

Manually Tested

Changelog

• fix(appliance): make environment variables strings to be passed around

[sourcegraph-release-bot]

The backport to 5.5.x failed at https://github.com/sourcegraph/sourcegraph/actions/runs/10206878241:

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 5.5.x -p 64227

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-5.5.x 5.5.x
# Navigate to the new working tree
cd .worktrees/backport-5.5.x
# Create a new branch
git switch --create backport-64227-to-5.5.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 856e41eff3bc36e0d87a84497692adff654e09cb
# Push it to GitHub
git push --set-upstream origin backport-64227-to-5.5.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-5.5.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-64227-to-5.5.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-5.5.x

• Follow above instructions to backport the commit.
• Create a pull request where the base branch is 5.5.x and the compare/head branch is backport-64227-to-5.5.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 5.5.x failed at https://github.com/sourcegraph/sourcegraph/actions/runs/10206878241:

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 5.5.x -p 64227

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-5.5.x 5.5.x
# Navigate to the new working tree
cd .worktrees/backport-5.5.x
# Create a new branch
git switch --create backport-64227-to-5.5.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 856e41eff3bc36e0d87a84497692adff654e09cb
# Push it to GitHub
git push --set-upstream origin backport-64227-to-5.5.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-5.5.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-64227-to-5.5.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-5.5.x

• Follow above instructions to backport the commit.
• Create a pull request where the base branch is 5.5.x and the compare/head branch is backport-64227-to-5.5.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.