readme improvements; comments

README.md

@@ -175,7 +175,7 @@ pnpm changeset
 ```
 And follow the instructions to create an appropriate changeset. Please ensure any contributions that touch code are accompanied by a changeset.
 
-### Building all with Docker
+### Building everything with Docker
 
 You can also build the PGlite from scratch by just issuing a docker build command:
 
@@ -187,6 +187,19 @@ You can then use this image, for example, to run the tests:
 
 `$ docker run pglitedocker bash -c "cd /workspace/packages/pglite && pnpm test"`
 
+#### Extract build artifacts from the docker image
+
+Following is an example of how you can extract the build artifacts created in the previous step:
+
+```
+$ container_id=$(docker create pglitedocker)
+$ docker cp "$container_id:/tmp/pglite/sdk" /tmp/
+$ docker cp "$container_id:/tmp/web/postgres.wasm" /tmp/
+$ docker rm "$container_id"
+```
+
+This will copy the sdk build artifacts folder as well as the postgres.wasm binary to your local /tmp folder
+
 ## Acknowledgments
 
 PGlite builds on the work of [Stas Kelvich](https://github.com/kelvich) of [Neon](https://neon.tech) in this [Postgres fork](https://github.com/electric-sql/postgres-wasm).

buildall.dockerfile

@@ -21,5 +21,6 @@ WORKDIR /workspace
 COPY . .
 
 RUN pnpm install
+# runs the wasm build without spinning yet another docker instance that would produce them
 RUN pnpm wasm:build-no-docker
 RUN pnpm ts:build