Add doscstrings to Dockerfile

docker/ecs/images/Dockerfile

@@ -1,25 +1,30 @@
 FROM python:3.10
 
+# Update the package list and upgrade all packages
 RUN apt-get update && \
     apt-get upgrade -y && \
+    # Install dependencies
     apt-get install  -y git jq && \
+    # Cleanup
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
+    # Clone elastic ECS repository and install required Python libraries
     git clone https://github.com/elastic/ecs.git && \
     pip install -r ecs/scripts/requirements.txt && \
+    # Create the directory for the ecs definitions (this will be used as a volume)
     mkdir -p /source/ecs
 
-# Change this to a volume
+# Ensure the generate.sh script is in the correct location
 ADD docker/ecs/images/generate.sh /ecs/generate.sh
-#ADD docker/ecs/images/entrypoint.sh entrypoint.sh
-#ADD ecs/ /source/ecs
-# This directory will be attached to a volume
-RUN mkdir -p /source/ecs
 
+# Define the directory as a volume to allow for external mounting
 VOLUME /source/ecs
 
+# Ensure the generate.sh script is executable
 RUN chmod +x /ecs/generate.sh
 
+# Set the working directory to the ECS repository
 WORKDIR /ecs
 
+# Define the entry point for the container to execute the generate.sh script
 ENTRYPOINT ["/bin/bash", "/ecs/generate.sh"]