Docker environment for developing on the package itself

.dockerignore

@@ -0,0 +1 @@
+**/node_modules

CONTRIBUTING.md

@@ -4,7 +4,51 @@ Thank you for your interest in contributing! While this project originated at In
 
 ## Getting Started
 
-We recommend setting up a local development instance by following these steps:
+### Developing in Docker Containers
+
+The easiest way to get a working development environment is with Docker. This gives you an IRIS instance with git-source-control pre-installed in development mode.
+
+#### Prerequisites
+
+- [Docker](https://www.docker.com/get-started/) installed and running
+- [VS Code](https://code.visualstudio.com/) with the [InterSystems ObjectScript Extension Pack](https://marketplace.visualstudio.com/items?itemName=intersystems-community.objectscript-pack)
+
+#### Setup
+
+```bash
+git clone https://github.com/intersystems/git-source-control
+cd git-source-control
+git checkout -b <new-branch-name>
+docker compose up -d --build
+```
+
+This spins up a single container:
+- **git-source-control-iris-1**: an IRIS instance with git-source-control loaded in dev mode in the USER namespace. The management portal is published to the host at port 52774.
+
+#### Important Notes
+
+- The repository is mounted at `/home/irisowner/dev/git-source-control/` inside the container.
+- If port 52774 is already in use, edit the port mapping in `docker-compose.yml`.
+- If you have an InterSystems license key at `~/iris.key`, it will be mounted into the container automatically.
+
+#### Development
+
+Make changes locally and compile them via VS Code. To access the IRIS terminal in the container:
+
+```bash
+docker compose exec -it iris iris session iris
+```
+
+To run the unit tests from the IRIS terminal:
+
+```
+zpm "git-source-control test -only -verbose"
+```
+
+### Developing on an Existing IRIS Instance
+
+If you prefer to use an existing IRIS installation:
+
 1. Install an instance of IRIS (go to https://evaluation.intersystems.com/ for an evaluation kit).
 2. Install IPM (InterSystems Package Manager) (https://github.com/intersystems/ipm).
 3. Clone a copy of the Embedded Git repository to disk using `git clone`.

Dockerfile

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+ARG BASE=containers.intersystems.com/intersystems/iris-community:2025.1
+
+FROM ${BASE}
+
+USER root
+RUN apt-get update && apt-get install -y git nodejs npm
+
+RUN --mount=type=bind,src=.,dst=/home/irisowner/dev/git-source-control/,rw \
+    chown -R irisowner:irisowner /home/irisowner/dev/git-source-control/ && \
+    su - irisowner -c "iris start iris" && \
+    su - irisowner -c "iris session IRIS < /home/irisowner/dev/git-source-control/iris.script" && \
+    su - irisowner -c "iris stop iris quietly"
+
+USER irisowner
+
+

docker-compose.yml

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+services:
+  iris:
+    build: .
+    restart: always
+    ports:
+      - 52774:52773
+    volumes:
+      - ~/iris.key:/usr/irissys/mgr/iris.key
+      - ./:/home/irisowner/dev/git-source-control/
+    command:
+      - -a
+      - iris session iris -U%SYS '##class(Security.Users).UnExpireUserPasswords("*")'

iris.script

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+  zn "USER"
+  // install IPM
+  s version="latest" s r=##class(%Net.HttpRequest).%New(),r.Server="pm.community.intersystems.com",r.SSLConfiguration="ISC.FeatureTracker.SSL.Config" d r.Get("/packages/zpm/"_version_"/installer"),$system.OBJ.LoadStream(r.HttpResponse.Data,"c")
+  // Load git-source-control in dev mode
+  zpm "load /home/irisowner/dev/git-source-control/ -dev -verbose"
+
+  halt