Add new page on instructions to create Docker images

Author: cjreed121

_docs/instructor/autograding/docker_images.md

@@ -0,0 +1,83 @@
+---
+title: Custom Docker Imagegs
+category: Instructor > Autograding
+---
+
+Some assignments may require specific languages, packages, libraries, etc.
+We can't install all of these different requirements on the base system.
+We offer the ability to use custom Docker images for autograding.
+We pull images from Dockerhub and allow you to run any command inside
+that container. Below are steps to make your own or edit an image:
+
+1. Create a Dockerfile or fetch an existing one
+
+    If this is a new Dockerfile, choose a base image.
+    We recommend you choose the same base image as your system OS (i.e. ubuntu:22.04)
+    but you could, in theory, pick any base image you want.
+
+2. Add any packages, libraries, languages, etc that you need
+
+3. Build your image locally
+
+    Run the following in the directory containing the Dockerfile.
+    Replace `NAME` with a tag name you would like for your Docker image.
+    ```
+    docker build -t NAME .
+    ```
+
+4. Test your image locally
+
+    Run the following to enter a bash shell inside your container:
+    ```
+    docker run --rm -it NAME bash
+    ```
+
+    Verify that you can call any specific commands you want to on Submitty.
+
+5. Push your tag to Dockerhub
+
+    First you need to tag your image in the proper format for Dockerhub.
+    An example would be `submitty/autograding-default:latest`.
+    ```
+    docker image tag NAME USERNAME/REPONAME:TAGNAME
+    ```
+
+    Next you need to push it to Dockerhub. If you have not logged into Docker on your CLI then run:
+    ```
+    docker login
+    ```
+
+    Finally, push the image:
+    ```
+    docker push USERNAME/REPONAME:TAGNAME
+    ```
+
+    _NOTE: At RPI, we maintain a [GitHub repo](https://github.com/Submitty/DockerImagesRPI)
+    to automate this process when Dockerfiles are updated in the correct location in the repo._
+
+6. Add the Docker image to Submitty via the Docker UI
+
+    Click [here](/instructor/autograding/docker_ui) to learn more about how to do this.
+
+7. In your autograding `config.json`, specify this new image.
+
+    In the root level of your JSON object, add:
+    ```
+    "autograding_method": "docker",
+    ```
+
+    You also need to choose your specific image which there are 2 ways to do this.
+
+    You can specify an image at the root level which will apply to all test cases.
+    Add the following to the root level of your JSON object:
+    ```
+    "container_options": {
+        "container_image": "IMAGE_NAME"
+    },
+    ```
+    Replace `IMAGE_NAME` with your full image tag you added to the Docker UI.
+    Once this is complete, you can specify the command you want to be run.
+
+    Another way this can be done is by specifying the image at each test case.
+    See [Networked Containers](/instructor/autograding/networking) for more on this.
+

navtreedata.js

@@ -126,6 +126,7 @@ var NAVTREE =
                 [ "Validation", "/instructor/autograding/validation", null ],
                 [ "Batch Regrade Submissions", "/instructor/autograding/batch_regrade", null ],
                 [ "Sample Assignments", "/instructor/autograding/sample_assignments", null ],
+                [ "Docker Images", "/instructor/autograding/docker_images", null ],
                 [ "Docker UI", "/instructor/autograding/docker_ui", null ],
                 [ "Static Analysis", "/instructor/autograding/static_analysis/index", [
                     [ "Overview", "/instructor/autograding/static_analysis/index", null ],