Upload .py source instead of .pyc bytecode

Remove compile(), marshal, and the hardcoded Python 3.10 .pyc magic
number. Upload plain .py source that the container's Python compiles
at runtime (<100ms overhead). This decouples host and container Python
versions, fixing deployment on Python 3.11/3.12 hosts.

Closes #38
Closes #59

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: szachovy

CHANGELOG.md

@@ -16,6 +16,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * CI workflow to build and push service images to GitHub Container Registry on master merge. (#97)
 * Pull-first with local build fallback for container images during deployment. (#97)
 
+### Fixed
+
+* Upload .py source instead of .pyc bytecode to decouple host Python version. (#38, #59)
+
 ### Changed
 
 * Completed [ARCHITECTURE.md](./docs/ARCHITECTURE.md) (#93)

src/remote.py

@@ -39,7 +39,6 @@
 import functools
 import io
 import logging
-import marshal
 import os
 import pathlib
 import random
@@ -124,12 +123,9 @@ def run_python_container_command(self, command: str) -> dict:
             mode="r",
             encoding="utf-8"
         ) as memfile:
-            code_object = compile(memfile.read() + command, filename=nonce, mode="exec")
-            pyc_file = io.BytesIO()
-            pyc_file.write(b'o\r\r\n\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
-            marshal.dump(code_object, pyc_file)
-            self.upload_file(content=pyc_file.getvalue(), remote_file_path=f'/opt/{nonce}.pyc')
-        _, stdout, stderr = self.ssh_client.exec_command(f"python3 /opt/{nonce}.pyc")
+            source = memfile.read() + command
+        self.upload_file(content=source, remote_file_path=f'/opt/{nonce}.py')
+        _, stdout, stderr = self.ssh_client.exec_command(f"python3 /opt/{nonce}.py")
         return {
             "output": stdout.read().decode(),
             "error": stderr.read().decode()