Initial fork of PyDuckling built against the latest version of Meta's…

… Duckling (#1)

This is a fork of the original pyduckling-native library. There are differences to the original:
* Build against the latest version of [Duckling](https://github.com/facebook/duckling)
* Supported Python versions range from 3.8 to 3.12
* x86_64 Linux only, but contributions welcome if you dare to take on the challenge

Internally some other things have changed as well:
* Updated to latest Maturin v1.4.0
  * Adapted Rust code to work with latest Maturin/Rust compiler
* Removed `GHC_VERSION` constant since Duckling will always be build with the same GHC version as the corresponding Duckling version
* Introduced Docker-based build pipeline
* Publish packages as manylinux/musllinux wheels
* Minor changes to various Markdown files

.dockerignore

@@ -0,0 +1,2 @@
+Dockerfile
+.cache

.github/workflows/build.yml

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+name: Build
+on:
+  push: {}
+  pull_request: {}
+  release:
+    types: [ published ]
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Cache build dependencies
+        uses: actions/cache@v4
+        env:
+          cache-name: cache-build-deps
+        with:
+          key: ${{ runner.os }}-build-${{ env.cache-name }}
+          path: |
+            .cache
+            duckling-ffi/.stack-work
+      - name: Run build script
+        run: |
+          ./build.sh
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: wheels
+          path: |
+            target/wheels/*.tar.gz
+            target/wheels/*.whl
+  publish:
+    needs: build-and-test
+    if: github.event_name == 'release'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download wheels
+        uses: actions/download-artifact@v4
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          packages-dir: target/wheels/
+          password: ${{ secrets.PYPI_API_TOKEN }}