Migrate to Github CI, test rust package compilation during CI

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  ci:
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: [3.8]
+        os: [ubuntu-20.04]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install Prerequisites
+        run: ./scripts/install-prereqs.sh
+      - name: Run tests
+        run: pytest
+      - name: Build a Rust package via colcon
+        run: ./scripts/build-rust-package.sh

README.md

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+# colcon-cargo
+
+![CI](https://github.com/colcon/colcon-cargo/workflows/ci/badge.svg)
+
+An extension for `colcon-core <https://github.com/colcon/colcon-core>`_ to
+support Rust projects built with Cargo.

scripts/build-rust-package.sh

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+#!/usr/bin/env bash
+set -e
+
+function announce() {
+    echo "================================================================================"
+    echo "$@"
+    echo "================================================================================"
+}
+
+# go to the root of the repo
+cd $(dirname $(readlink -f $0))/..
+
+# build with colcon and source
+announce "Building and sourcing colcon-cargo"
+colcon build
+source install/setup.sh
+
+# now build a sample rust package
+announce "Building and sourcing sample Ruts app"
+cd test/rust-sample-package
+colcon build
+source install/setup.sh
+
+# is the rust package properly installed?
+output=$(app 2>&1)
+[[ "$output"=="Hello, world!" ]] || {
+    echo "Didn't get the expected output."
+    echo "Output:  $output"
+}

scripts/install-prereqs.sh

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+#!/usr/bin/env bash
+pip install --upgrade setuptools \
+    git+https://github.com/colcon/colcon-core \
+    git+https://github.com/colcon/colcon-library-path \
+    pytest pytest-cov \
+    pyenchant \
+    flake8-blind-except flake8-builtins flake8-class-newline \
+    flake8-comprehensions flake8-deprecated flake8-docstrings flake8-quotes \
+    pep8-naming pylint
+

test/rust-sample-package/Cargo.toml

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+[package]
+name = "app"
+version = "0.1.0"
+authors = ["Nikos Koukis <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

test/rust-sample-package/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}