Make the Docker image cross-compile without QEMU emulation (#129)

* Bump all dependencies & disable the pyo3 feature by default.
* Make the Docker image cross-compile without QEMU emulation
* Add a build cache on the Docker image

synapse_auto_compressor/pyproject.toml

@@ -0,0 +1,8 @@
+[build-system]
+requires = ["maturin>=1.0,<2.0"]
+build-backend = "maturin"
+
+[tool.maturin]
+profile = "release"
+features = ["pyo3"]
+no-default-features = true