Add initialization-block to tycho runner, fix docker and improve docs

testing/Dockerfile

@@ -7,7 +7,7 @@ WORKDIR /app
 # Add current directory code to /app in container
 ADD . /app/testing
 
-RUN chmod +x /app/testing/tycho-indexer-linux-x64
+RUN chmod +x /app/testing/tycho-indexer
 
 # Create a new conda environment and install pip
 RUN conda create -n myenv pip python=3.9
@@ -21,7 +21,8 @@ RUN apt-get update \
     && pip install psycopg2 \
     && apt-get clean
 
-RUN /bin/bash -c "source activate myenv && cd testing && pip install --no-cache-dir -r requirements.txt && cd -"
+ARG PIP_INDEX_URL
+RUN /bin/bash -c "source activate myenv && cd testing && pip install --no-cache-dir -r src/requirements.txt && cd -"
 
 # Make port 80 available to the world outside this container
 EXPOSE 80
@@ -31,4 +32,4 @@ RUN wget -c https://github.com/streamingfast/substreams/releases/download/v1.8.0
 RUN mv substreams /usr/local/bin/substreams && chmod +x /usr/local/bin/substreams
 
 # Run the command to start your application
-CMD ["python", "testing/cli.py", "--test_yaml_path", "/app/substreams/my_substream/test_assets.yaml", "--with_binary_logs", "--db_url", "postgres://postgres:mypassword@db:5432"]
+CMD ["python", "testing/src/runner/cli.py", "--package", "my_substream", "--with_binary_logs", "--db_url", "postgres://postgres:mypassword@db:5432"]