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README.md

@@ -1 +1,33 @@
-# buildroot_elixir
+# buildroot_elixir
+
+## Running in Docker
+
+Create an `.env` file:
+```shell
+IMAGE_NAME="foo-app"
+IMAGE_OWNER="cogini"
+```
+
+Build dev image:
+
+```command
+docker compose build
+```
+
+Run dev image:
+
+```command
+docker compose run buildroot-dev
+```
+
+Inside the container
+
+```command
+[ -d /opt/buildroot/.git ] || git clone $BUILDROOT_GIT_REPO /opt/buildroot
+git config pull.rebase true \
+git checkout $BUILDROOT_TAG && \
+git pull origin $BUILDROOT_TAG
+make BR2_EXTERNAL="/buildroot" $BUILDROOT_DEFCONFIG
+make
+cp /opt/buildroot/output/images/sdcard.img /tmp/output
+```