add container based dev flow

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

.github/CONTRIBUTING.md

@@ -14,6 +14,20 @@ Contributions to this project are [released](https://help.github.com/articles/gi
 6. Push to your fork and [submit a pull request](https://github.com/docker/setup-buildx-action/compare)
 7. Pat yourself on the back and wait for your pull request to be reviewed and merged.
 
+## Container based developer flow
+
+If you don't want to maintain a Node developer environment that fits this project you can use containerized commands instead of invoking yarn directly.
+
+```
+# format code and build javascript artifacts
+docker buildx bake pre-checkin
+
+# validate all code has correctly formatted and built
+docker buildx bake validate
+```
+
+Note that tests target are currently known to not pass outside Github infrastructure.
+
 Here are a few things you can do that will increase the likelihood of your pull request being accepted:
 
 - Make sure the `README.md` and any other relevant **documentation are kept up-to-date**.

.github/workflows/test.yml

@@ -12,6 +12,15 @@ on:
       - "**.md"
 
 jobs:
+  test-containerized:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2.3.2
+      -
+        name: Validate
+        run: docker buildx bake validate
   test:
     runs-on: ubuntu-latest
     steps: