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

pyproject.toml

@@ -1,4 +1,8 @@
 [build-system]
-requires = ["maturin>=0.11,<0.12"]
+requires = ["maturin>=1.0,<2.0"]
 build-backend = "maturin"
-cargo-extra-args = "--no-default-features"
+
+[tool.maturin]
+profile = "release"
+features = ["pyo3"]
+no-default-features = true