Setup github ci (#47)

* Adapted CI configuration from travis to github

.github/workflows/rust.yml

@@ -0,0 +1,133 @@
+name: Rust
+
+on: [push, pull_request]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      max-parallel: 2
+      matrix:
+        rust: [stable, beta, nightly, 1.41.0]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: ci-all-versions
+      run: |
+        rustup override set ${{ matrix.rust }}
+        rustup install beta
+
+        env CARGO_BUILD_JOBS=1
+
+        cd "${{github.workspace}}/examples/0_modules_and_interface_types/impl/"
+        cargo +beta build
+
+        cd "${{github.workspace}}/examples/1_trait_objects/plugin_0/"
+        cargo +beta build
+
+        cd "${{github.workspace}}/examples/1_trait_objects/plugin_1/"
+        cargo +beta build
+
+        cd "${{github.workspace}}/examples/2_nonexhaustive/implementation/"
+        cargo +beta build
+
+        cd "${{github.workspace}}/testing/0/impl_0/"
+        cargo +beta build
+
+        cd "${{github.workspace}}/testing/1 - loading errors/impl_1/"
+        cargo +beta build
+
+        cd "${{github.workspace}}/testing/1 - loading errors/non_abi_stable_lib/"
+        cargo +beta build
+
+        cd "${{github.workspace}}/testing/version_compatibility/impl_0"
+        cargo +beta build
+
+        cd "${{github.workspace}}/"
+        rm Cargo.lock
+
+        cd "${{github.workspace}}/examples/0_modules_and_interface_types/impl/"
+        cargo check
+
+        cd "${{github.workspace}}/examples/1_trait_objects/plugin_0/"
+        cargo check
+
+        cd "${{github.workspace}}/examples/1_trait_objects/plugin_1/"
+        cargo check
+
+        cd "${{github.workspace}}/examples/2_nonexhaustive/implementation/"
+        cargo check
+
+        cd "${{github.workspace}}/testing/0/impl_0/"
+        cargo check
+
+        cd "${{github.workspace}}/testing/1 - loading errors/impl_1/"
+        cargo check
+
+        cd "${{github.workspace}}/testing/1 - loading errors/non_abi_stable_lib/"
+        cargo check
+
+        cd "${{github.workspace}}/abi_stable"
+        cargo check --no-default-features
+
+        cd "${{github.workspace}}/abi_stable_derive"
+        cargo test
+
+        cd "${{github.workspace}}/abi_stable"
+        cargo test --features "testing sabi_trait_examples"
+
+        cd "${{github.workspace}}/examples/0_modules_and_interface_types/impl/"
+        cargo test
+        cd "${{github.workspace}}/examples/0_modules_and_interface_types/user/"
+        cargo run -- run-tests
+
+        cd "${{github.workspace}}/examples/1_trait_objects/application/"
+        cargo run
+
+        cd "${{github.workspace}}/examples/2_nonexhaustive/implementation/"
+        cargo test
+        cd "${{github.workspace}}/examples/2_nonexhaustive/user/"
+        cargo run
+        cd "${{github.workspace}}/testing/0/user_0/"
+        cargo run
+        cd "${{github.workspace}}/testing/1 - loading errors/user_1/"
+        env "RETURN=ok" cargo run
+        env "RETURN=error" cargo run
+        env "RETURN=panic" cargo run
+
+        cd "${{github.workspace}}/testing/version_compatibility/user_0"
+        cargo run
+
+    - uses: actions/checkout@v2
+    - name: ci-nighly
+      if: ${{ matrix.rust == 'nightly' && runner.os == 'Linux' }}
+      run: |
+        env CARGO_BUILD_JOBS=1
+        
+        rustup override set nightly
+
+        cd "${{github.workspace}}/abi_stable/"
+        MIRI_NIGHTLY=nightly-$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)
+        echo "Installing latest nightly with Miri"
+        echo "$MIRI_NIGHTLY"
+        rustup set profile minimal
+        rustup default "$MIRI_NIGHTLY"
+        rustup override set "$MIRI_NIGHTLY"
+        rustup component add miri
+        cargo miri setup
+        env "MIRIFLAGS=-Zmiri-disable-isolation" cargo miri test --features testing
+
+        cd "${{github.workspace}}"
+        rm Cargo.lock
+        cd "${{github.workspace}}/abi_stable/"
+        cargo clean
+        cargo update -Z minimal-versions
+        cd "${{github.workspace}}/abi_stable/"
+        cargo build
+
+