Add a helper script to work with track pull .remote files

[nzwulfin]

The instruqt command doesn't currently do diffs when a track is pulled and we aren't using the GitHub beta integration, so comparing the remote files created by instruqt track pull to the local branch is manual and tedious.

This script will compare all of the .remote files found with their local versions. It prints the diff if there is a difference, otherwise it removes the file.

Sample run

╭╢ X  mmicene  ~  Projects   …   instruqt  image-mode-basics  mmicene-600+*  
╰╴instruqt track pull
==> Finding track by slug: rhel/image-mode-basics 
    [ERROR] Track has both remote and local changes
    
    Writing remote track to '*.remote' files, please update your local track before pushing. Either:
    1) Use `instruqt track pull --force` to overwrite your local changes, or
    2) Resolve the differences yourself using your favorite diff tool and editor.
    
    Writing track:
image-mode-basics
├── 01-create-an-image
│   ├── assignment.md.remote
│   └── check-rhel.remote
├── 02-deploy-an-image
│   └── assignment.md.remote
├── 03-add-software-to-image
│   ├── assignment.md.remote
│   └── check-rhel.remote
├── 04-apply-image
│   └── assignment.md.remote
├── track_scripts
│   ├── cleanup-rhel
│   └── setup-rhel
├── config.yml.remote
└── track.yml.remote
    OK
╭╢ X  mmicene  ~  Projects   …   instruqt  image-mode-basics  mmicene-600+*  
╰╴find . -name "*.remote"
./01-create-an-image/assignment.md.remote
./01-create-an-image/check-rhel.remote
./02-deploy-an-image/assignment.md.remote
./03-add-software-to-image/check-rhel.remote
./03-add-software-to-image/assignment.md.remote
./04-apply-image/assignment.md.remote
./track.yml.remote
./config.yml.remote
╭╢ X  mmicene  ~  Projects   …   instruqt  image-mode-basics  mmicene-600+*  
╰╴../instruqt_diff.sh 
--- ./01-create-an-image/assignment.md.remote	2024-12-10 13:56:41.559614672 -0500
+++ ./01-create-an-image/assignment.md	2024-12-10 13:14:41.737971729 -0500
@@ -29,10 +29,12 @@
 
 Welcome to this lab experience for Red Hat Enterprise Linux.
 
-The system displayed beside this text is a Red Hat Enterprise Linux 9
-system registered with Subscription Manager.
+The system displayed beside this text is a Red Hat Enterprise Linux 9 system registered with Subscription Manager.
 
-Image mode uses standard container tools to define, build, and transport bootc images. Podman has already been installed on this host as a build environment, along with some additional files.
+Image mode uses standard container tools to define, build, and transport bootc images. Podman has already been installed on this host as a build environment, along with some additional files and required images. If you see an error related to authentication like the one below, you can use the `reglogin` command provided to log into the Red Hat Container Registry and re-run the command.
+```
+unable to retrieve auth token: invalid username/password: unauthorized: Please login to the Red Hat Registry using your Customer Portal credentials.
+```
 
 Examine the containerfile
 ===
./01-create-an-image/check-rhel.remote same, removing
./02-deploy-an-image/assignment.md.remote same, removing
./03-add-software-to-image/check-rhel.remote same, removing
./03-add-software-to-image/assignment.md.remote same, removing
./04-apply-image/assignment.md.remote same, removing
--- ./track.yml.remote	2024-12-10 13:56:41.559614672 -0500
+++ ./track.yml	2024-12-10 11:54:27.999348968 -0500
@@ -27,5 +27,5 @@
   hideStopButton: false
   default_layout: AssignmentRight
   default_layout_sidebar_size: 33
-checksum: "13024264225583185968"
+checksum: "9483646692229430784"
 enhanced_loading: false
./config.yml.remote same, removing
╭╢ X  mmicene  ~  Projects   …   instruqt  image-mode-basics  mmicene-600+*  
╰╴find . -name "*.remote"
./01-create-an-image/assignment.md.remote
./track.yml.remote

It's best to run it inside a track directory, there's not a huge number of guardrails at the moment.