Switch to using GitHub Actions as CI provider

GitLab has repeatedly messed with webhooks, repository mirroring, and CI
itself in sinister ways that silently broke our CI from one day to the
next, without any advance notice, acknowledgment, or even hint what they
have done this time. On top of that, debugging their solution is a
nightmare and time sink, because they provide virtually no insight into
what is going on (at least not without involvement of third party
services) and their API endpoints may just indicate success and still do
nothing.
This time it appears that they decided to remove "pull" mirroring from
the free tier altogether, meaning that we can no longer keep code on
GitLab in sync with that on GitHub, assuming it is being pushed to the
latter. That renders their product entirely useless for our intents and
purposes.
To that end, this change switches over to using GitHub Actions as the CI
provider. While there are some direct advantages to this switch, such as
the much faster compilation and proper pull request integration, their
artifact upload is unusable for our intents and purposes. Uploaded
artifacts are seemingly always exposed as a zip archive and there is no
way to link to the most recent artifact. For us that means that code
coverage can no longer directly rely on generated HTML artifacts. As
such, we have to switch over to relying on codecov.io as the service to
which we upload collected data to be visualized.
Because GitHub Actions modules are readily available for usage of
Tarpaulin, we switch from kcov to Tarpaulin for coverage assessment (a
step which we had intended on doing irrespectively at some point
anyway). We considered the usage of grcov, which has the potential to
provide more accurate coverage information, but at this point overall
toolchain support seems to be in its infancy, with rustc panicking all
over the place, making Tarpaulin the better choice.
Aside from that those two changes, the provided CI functionality should
be largely identical.

.github/workflows/ci.yml

@@ -0,0 +1,54 @@
+# Copyright (C) 2022 Daniel Mueller <[email protected]>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+name: CI
+
+on: [push, pull_request]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  test:
+    name: Build and test with cargo ${{ matrix.rust }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [1.57.0, stable]
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ matrix.rust }}
+        profile: minimal
+        override: true
+    - name: Build
+      run: cargo build
+    - if: ${{ matrix.rust != 'stable' }}
+      name: Run tests
+      run: cargo test -- --include-ignored
+    - if: ${{ matrix.rust == 'stable' }}
+      name: Run tests
+      uses: actions-rs/[email protected]
+      with:
+        version: latest
+        args: -- --include-ignored
+        out-type: Xml
+    - if: ${{ matrix.rust == 'stable' }}
+      name: Upload code coverage results
+      uses: codecov/codecov-action@v3
+      with:
+        files: cobertura.xml
+  clippy:
+    name: Lint with clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.57.0
+          components: clippy
+          override: true
+      - run: cargo clippy --no-deps --all-targets --all-features -- -A unknown_lints -D warnings

CHANGELOG.md

@@ -1,5 +1,6 @@
 Unreleased
 ----------
+- Switched to using GitHub Actions as CI provider
 - Bumped minimum supported Rust version to `1.57`
 - Bumped `tokio-tungstenite` dependency to `0.17`
 

README.md

@@ -1,5 +1,5 @@
-[![pipeline](https://gitlab.com/d-e-s-o/websocket-util/badges/main/pipeline.svg)](https://gitlab.com/d-e-s-o/websocket-util/commits/main)
-[![coverage](https://gitlab.com/d-e-s-o/websocket-util/badges/main/coverage.svg)](https://gitlab.com/d-e-s-o/websocket-util/-/jobs/artifacts/main/file/kcov/kcov-merged/index.html?job=coverage:kcov)
+[![pipeline](https://github.com/d-e-s-o/websocket-util/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/d-e-s-o/websocket-util/actions/workflows/ci.yml)
+[![coverage](https://codecov.io/gh/d-e-s-o/websocket-util/branch/main/graph/badge.svg)](https://codecov.io/gh/d-e-s-o/websocket-util)
 [![crates.io](https://img.shields.io/crates/v/websocket-util.svg)](https://crates.io/crates/websocket-util)
 [![Docs](https://docs.rs/websocket-util/badge.svg)](https://docs.rs/websocket-util)
 [![rustc](https://img.shields.io/badge/rustc-1.57+-blue.svg)](https://blog.rust-lang.org/2021/12/02/Rust-1.57.0.html)