autoinstrumentation: install musl in Python Docker image

Author: xrmx

autoinstrumentation/python/Dockerfile

@@ -1,12 +1,12 @@
 # To build one auto-instrumentation image for Python, please:
-# - Ensure the packages are installed in the `/autoinstrumentation` directory. This is required as when instrumenting the pod,
-#   one init container will be created to copy all the content in `/autoinstrumentation` directory to your app's container. Then
+# - Ensure the packages are installed in the `/autoinstrumentation,{-musl}` directory. This is required as when instrumenting the pod,
+#   one init container will be created to copy all the content in `/autoinstrumentation{,-musl}` directory to your app's container. Then
 #   update the `PYTHONPATH` environment variable accordingly. To achieve this, you can mimic the one in `autoinstrumentation/python/Dockerfile`
 #   by using multi-stage builds. In the first stage, install all the required packages in one custom directory with `pip install --target`.
-#   Then in the second stage, copy the directory to `/autoinstrumentation`.
+#   Then in the second stage, copy the directory to `/autoinstrumentation{,-musl}`.
 # - Ensure you have `opentelemetry-distro` and `opentelemetry-instrumentation` or your customized alternatives installed.
 #   Those two packages are essential to Python auto-instrumentation.
-# - Grant the necessary access to `/autoinstrumentation` directory. `chmod -R go+r /autoinstrumentation`
+# - Grant the necessary access to `/autoinstrumentation{,-musl}` directory. `chmod -R go+r /autoinstrumentation`
 # - For auto-instrumentation by container injection, the Linux command cp is
 #   used and must be availabe in the image.
 FROM python:3.11 AS build
@@ -17,8 +17,19 @@ ADD requirements.txt .
 
 RUN mkdir workspace && pip install --target workspace -r requirements.txt
 
+FROM python:3.11-alpine AS build-musl
+
+WORKDIR /operator-build
+
+ADD requirements.txt .
+
+RUN apk add gcc python3-dev musl-dev linux-headers
+RUN mkdir workspace && pip install --target workspace -r requirements.txt
+
 FROM busybox
 
 COPY --from=build /operator-build/workspace /autoinstrumentation
+COPY --from=build-musl /operator-build/workspace /autoinstrumentation-musl
 
 RUN chmod -R go+r /autoinstrumentation
+RUN chmod -R go+r /autoinstrumentation-musl