Optimize docker image

The current image is >1.2gb and not at all optimized. We can utilize the
python-slim base image and remove unnecessary files in the image. With
these changes we cut the image size to less than half (500mb on my local
machine).

Dockerfile

@@ -1,13 +1,20 @@
-FROM python:3.12
+FROM python:3.12-slim
 
 EXPOSE 8126
 
 ENV SNAPSHOT_CI=1
 ENV LOG_LEVEL=INFO
 ENV SNAPSHOT_DIR=/snapshots
 
+RUN apt update && apt install -y git
+
 RUN mkdir -p /src
 WORKDIR /src
 COPY . /src
 RUN pip install /src
+
+# Cleanup
+RUN apt remove -y git
+RUN rm -rf /var/lib/apt/lists/* /root/.cache/pip /tmp/* /var/tmp/* /src
+
 CMD ["ddapm-test-agent"]

releasenotes/notes/image-optimization-d614eccb59441217.yaml

@@ -0,0 +1,4 @@
+---
+other:
+  - |
+    The image size has been cut roughly in half.